diff --git a/src/plugins/platforms/wayland/global/qwaylandclientextension.cpp b/src/plugins/platforms/wayland/global/qwaylandclientextension.cpp
index 60a8944f8bf..125b1e19d94 100644
--- a/src/plugins/platforms/wayland/global/qwaylandclientextension.cpp
+++ b/src/plugins/platforms/wayland/global/qwaylandclientextension.cpp
@@ -49,10 +49,6 @@
 QT_BEGIN_NAMESPACE
 
 QWaylandClientExtensionPrivate::QWaylandClientExtensionPrivate()
-    : QObjectPrivate()
-    , waylandIntegration(nullptr)
-    , version(-1)
-    , active(false)
 {
     // Keep the possibility to use a custom waylandIntegration as a plugin,
     // but also add the possibility to run it as a QML component.
diff --git a/src/plugins/platforms/wayland/global/qwaylandclientextension_p.h b/src/plugins/platforms/wayland/global/qwaylandclientextension_p.h
index 0fd59b3f782..69cc46a0a48 100644
--- a/src/plugins/platforms/wayland/global/qwaylandclientextension_p.h
+++ b/src/plugins/platforms/wayland/global/qwaylandclientextension_p.h
@@ -65,16 +65,15 @@ public:
     static void handleRegistryGlobal(void *data, ::wl_registry *registry, uint32_t id,
                                      const QString &interface, uint32_t version);
 
-    QtWaylandClient::QWaylandIntegration *waylandIntegration;
-    int version;
-    bool active;
+    QtWaylandClient::QWaylandIntegration *waylandIntegration = nullptr;
+    int version = -1;
+    bool active = false;
 };
 
 class Q_WAYLAND_CLIENT_EXPORT QWaylandClientExtensionTemplatePrivate : public QWaylandClientExtensionPrivate
 {
 public:
     QWaylandClientExtensionTemplatePrivate()
-        : QWaylandClientExtensionPrivate()
     { }
 };
 
diff --git a/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration.cpp b/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration.cpp
index 013ddae9f5a..d966a1919d2 100644
--- a/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration.cpp
+++ b/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration.cpp
@@ -44,7 +44,6 @@ QT_BEGIN_NAMESPACE
 namespace QtWaylandClient {
 
 QWaylandServerBuffer::QWaylandServerBuffer()
-    : m_user_data(nullptr)
 {
 }
 
diff --git a/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h b/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h
index 3b8b3a6de2f..7439087d885 100644
--- a/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h
+++ b/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h
@@ -89,7 +89,7 @@ protected:
     QSize m_size;
 
 private:
-    void *m_user_data;
+    void *m_user_data = nullptr;
 };
 
 class Q_WAYLAND_CLIENT_EXPORT QWaylandServerBufferIntegration
diff --git a/src/plugins/platforms/wayland/plugins/decorations/bradient/main.cpp b/src/plugins/platforms/wayland/plugins/decorations/bradient/main.cpp
index ceb07c8032d..9a7e91e6f7b 100644
--- a/src/plugins/platforms/wayland/plugins/decorations/bradient/main.cpp
+++ b/src/plugins/platforms/wayland/plugins/decorations/bradient/main.cpp
@@ -153,14 +153,12 @@ private:
     QColor m_foregroundColor;
     QColor m_backgroundColor;
     QStaticText m_windowTitle;
-    Button m_clicking;
+    Button m_clicking = None;
 };
 
 
 
 QWaylandBradientDecoration::QWaylandBradientDecoration()
-    : QWaylandAbstractDecoration()
-    , m_clicking(None)
 {
     QPalette palette;
     m_foregroundColor = palette.color(QPalette::Active, QPalette::HighlightedText);
diff --git a/src/plugins/platforms/wayland/qwaylandabstractdecoration.cpp b/src/plugins/platforms/wayland/qwaylandabstractdecoration.cpp
index 6a7a2ef4cdb..c20b70e9e29 100644
--- a/src/plugins/platforms/wayland/qwaylandabstractdecoration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandabstractdecoration.cpp
@@ -60,21 +60,17 @@ public:
     QWaylandAbstractDecorationPrivate();
     ~QWaylandAbstractDecorationPrivate();
 
-    QWindow *m_window;
-    QWaylandWindow *m_wayland_window;
+    QWindow *m_window = nullptr;
+    QWaylandWindow *m_wayland_window = nullptr;
 
-    bool m_isDirty;
+    bool m_isDirty = true;
     QImage m_decorationContentImage;
 
-    Qt::MouseButtons m_mouseButtons;
+    Qt::MouseButtons m_mouseButtons = Qt::NoButton;
 };
 
 QWaylandAbstractDecorationPrivate::QWaylandAbstractDecorationPrivate()
-    : m_window(nullptr)
-    , m_wayland_window(nullptr)
-    , m_isDirty(true)
-    , m_decorationContentImage(nullptr)
-    , m_mouseButtons(Qt::NoButton)
+    : m_decorationContentImage(nullptr)
 {
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylandbuffer.cpp b/src/plugins/platforms/wayland/qwaylandbuffer.cpp
index 2dc99b3b758..9792cdd6136 100644
--- a/src/plugins/platforms/wayland/qwaylandbuffer.cpp
+++ b/src/plugins/platforms/wayland/qwaylandbuffer.cpp
@@ -47,8 +47,6 @@ QT_BEGIN_NAMESPACE
 namespace QtWaylandClient {
 
 QWaylandBuffer::QWaylandBuffer()
-              : mBuffer(nullptr)
-              , mBusy(false)
 {
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylandbuffer_p.h b/src/plugins/platforms/wayland/qwaylandbuffer_p.h
index 9e8cba2e490..156ea9530b4 100644
--- a/src/plugins/platforms/wayland/qwaylandbuffer_p.h
+++ b/src/plugins/platforms/wayland/qwaylandbuffer_p.h
@@ -77,10 +77,10 @@ public:
     bool busy() const { return mBusy; }
 
 protected:
-    struct wl_buffer *mBuffer;
+    struct wl_buffer *mBuffer = nullptr;
 
 private:
-    bool mBusy;
+    bool mBusy = false;
 
     static void release(void *data, wl_buffer *);
     static const wl_buffer_listener listener;
diff --git a/src/plugins/platforms/wayland/qwaylanddatadevice.cpp b/src/plugins/platforms/wayland/qwaylanddatadevice.cpp
index 83912035a4f..4411ba65ccd 100644
--- a/src/plugins/platforms/wayland/qwaylanddatadevice.cpp
+++ b/src/plugins/platforms/wayland/qwaylanddatadevice.cpp
@@ -66,11 +66,6 @@ QWaylandDataDevice::QWaylandDataDevice(QWaylandDataDeviceManager *manager, QWayl
     : QtWayland::wl_data_device(manager->get_data_device(inputDevice->wl_seat()))
     , m_display(manager->display())
     , m_inputDevice(inputDevice)
-    , m_enterSerial(0)
-    , m_dragWindow(nullptr)
-    , m_dragPoint()
-    , m_dragOffer()
-    , m_selectionOffer()
 {
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylanddatadevice_p.h b/src/plugins/platforms/wayland/qwaylanddatadevice_p.h
index 7fb0003b4dd..29461930b37 100644
--- a/src/plugins/platforms/wayland/qwaylanddatadevice_p.h
+++ b/src/plugins/platforms/wayland/qwaylanddatadevice_p.h
@@ -117,9 +117,9 @@ private:
     QPoint calculateDragPosition(int x, int y, QWindow *wnd) const;
 #endif
 
-    QWaylandDisplay *m_display;
-    QWaylandInputDevice *m_inputDevice;
-    uint32_t m_enterSerial;
+    QWaylandDisplay *m_display = nullptr;
+    QWaylandInputDevice *m_inputDevice = nullptr;
+    uint32_t m_enterSerial = 0;
     QPointer<QWindow> m_dragWindow;
     QPoint m_dragPoint;
     QScopedPointer<QWaylandDataOffer> m_dragOffer;
diff --git a/src/plugins/platforms/wayland/qwaylanddataoffer.cpp b/src/plugins/platforms/wayland/qwaylanddataoffer.cpp
index 2491c658b12..35085a7f0d5 100644
--- a/src/plugins/platforms/wayland/qwaylanddataoffer.cpp
+++ b/src/plugins/platforms/wayland/qwaylanddataoffer.cpp
@@ -87,8 +87,7 @@ void QWaylandDataOffer::data_offer_offer(const QString &mime_type)
 }
 
 QWaylandMimeData::QWaylandMimeData(QWaylandDataOffer *dataOffer, QWaylandDisplay *display)
-    : QInternalMimeData()
-    , m_dataOffer(dataOffer)
+    : m_dataOffer(dataOffer)
     , m_display(display)
 {
 }
diff --git a/src/plugins/platforms/wayland/qwaylanddisplay.cpp b/src/plugins/platforms/wayland/qwaylanddisplay.cpp
index 179c0454e0c..abb0845225f 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay.cpp
+++ b/src/plugins/platforms/wayland/qwaylanddisplay.cpp
@@ -124,20 +124,6 @@ QWaylandWindowManagerIntegration *QWaylandDisplay::windowManagerIntegration() co
 
 QWaylandDisplay::QWaylandDisplay(QWaylandIntegration *waylandIntegration)
     : mWaylandIntegration(waylandIntegration)
-#if QT_CONFIG(wayland_datadevice)
-    , mDndSelectionHandler(nullptr)
-#endif
-    , mWindowExtension(nullptr)
-    , mSubCompositor(nullptr)
-    , mTouchExtension(nullptr)
-    , mQtKeyExtension(nullptr)
-    , mTextInputManager(nullptr)
-    , mHardwareIntegration(nullptr)
-    , mLastInputSerial(0)
-    , mLastInputDevice(nullptr)
-    , mLastInputWindow(nullptr)
-    , mLastKeyboardFocus(nullptr)
-    , mSyncCallback(nullptr)
 {
     qRegisterMetaType<uint32_t>("uint32_t");
 
diff --git a/src/plugins/platforms/wayland/qwaylanddisplay_p.h b/src/plugins/platforms/wayland/qwaylanddisplay_p.h
index 35d861760e5..0a7ea427a5d 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay_p.h
+++ b/src/plugins/platforms/wayland/qwaylanddisplay_p.h
@@ -217,12 +217,12 @@ private:
     int mWritableNotificationFd;
     QList<RegistryGlobal> mGlobals;
     int mCompositorVersion;
-    uint32_t mLastInputSerial;
-    QWaylandInputDevice *mLastInputDevice;
+    uint32_t mLastInputSerial = 0;
+    QWaylandInputDevice *mLastInputDevice = nullptr;
     QPointer<QWaylandWindow> mLastInputWindow;
     QPointer<QWaylandWindow> mLastKeyboardFocus;
     QVector<QWaylandWindow *> mActiveWindows;
-    struct wl_callback *mSyncCallback;
+    struct wl_callback *mSyncCallback = nullptr;
     static const wl_callback_listener syncCallbackListener;
 
     void registry_global(uint32_t id, const QString &interface, uint32_t version) override;
diff --git a/src/plugins/platforms/wayland/qwaylandinputcontext.cpp b/src/plugins/platforms/wayland/qwaylandinputcontext.cpp
index 16ee057c54e..58ad90d41b5 100644
--- a/src/plugins/platforms/wayland/qwaylandinputcontext.cpp
+++ b/src/plugins/platforms/wayland/qwaylandinputcontext.cpp
@@ -71,15 +71,6 @@ const Qt::InputMethodQueries supportedQueries = Qt::ImEnabled |
 QWaylandTextInput::QWaylandTextInput(QWaylandDisplay *display, struct ::zwp_text_input_v2 *text_input)
     : QtWayland::zwp_text_input_v2(text_input)
     , m_display(display)
-    , m_builder()
-    , m_serial(0)
-    , m_surface(nullptr)
-    , m_preeditCommit()
-    , m_inputPanelVisible(false)
-    , m_keyboardRectangle()
-    , m_locale()
-    , m_inputDirection(Qt::LayoutDirectionAuto)
-    , m_resetCallback(nullptr)
 {
 }
 
@@ -391,9 +382,7 @@ Qt::KeyboardModifiers QWaylandTextInput::modifiersToQtModifiers(uint32_t modifie
 }
 
 QWaylandInputContext::QWaylandInputContext(QWaylandDisplay *display)
-    : QPlatformInputContext()
-    , mDisplay(display)
-    , mCurrentWindow()
+    : mDisplay(display)
 {
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylandinputcontext_p.h b/src/plugins/platforms/wayland/qwaylandinputcontext_p.h
index a131bc5bdf6..a554f23011c 100644
--- a/src/plugins/platforms/wayland/qwaylandinputcontext_p.h
+++ b/src/plugins/platforms/wayland/qwaylandinputcontext_p.h
@@ -112,17 +112,17 @@ private:
 
     QVector<Qt::KeyboardModifier> m_modifiersMap;
 
-    uint32_t m_serial;
-    struct ::wl_surface *m_surface;
+    uint32_t m_serial = 0;
+    struct ::wl_surface *m_surface = nullptr;
 
     QString m_preeditCommit;
 
-    bool m_inputPanelVisible;
+    bool m_inputPanelVisible = false;
     QRectF m_keyboardRectangle;
     QLocale m_locale;
-    Qt::LayoutDirection m_inputDirection;
+    Qt::LayoutDirection m_inputDirection = Qt::LayoutDirectionAuto;
 
-    struct ::wl_callback *m_resetCallback;
+    struct ::wl_callback *m_resetCallback = nullptr;
     static const wl_callback_listener callbackListener;
     static void resetCallback(void *data, struct wl_callback *wl_callback, uint32_t time);
 };
diff --git a/src/plugins/platforms/wayland/qwaylandinputdevice.cpp b/src/plugins/platforms/wayland/qwaylandinputdevice.cpp
index b34504a1f4b..93344d13fed 100644
--- a/src/plugins/platforms/wayland/qwaylandinputdevice.cpp
+++ b/src/plugins/platforms/wayland/qwaylandinputdevice.cpp
@@ -200,8 +200,7 @@ QWaylandInputDevice::Touch::~Touch()
 }
 
 QWaylandInputDevice::QWaylandInputDevice(QWaylandDisplay *display, int version, uint32_t id)
-    : QObject()
-    , QtWayland::wl_seat(display->wl_registry(), id, qMin(version, 4))
+    : QtWayland::wl_seat(display->wl_registry(), id, qMin(version, 4))
     , mQDisplay(display)
     , mDisplay(display->wl_display())
     , mVersion(qMin(version, 4))
diff --git a/src/plugins/platforms/wayland/qwaylandintegration.cpp b/src/plugins/platforms/wayland/qwaylandintegration.cpp
index 267e481ac9c..fe1655c9f30 100644
--- a/src/plugins/platforms/wayland/qwaylandintegration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandintegration.cpp
@@ -121,16 +121,11 @@ public:
 };
 
 QWaylandIntegration::QWaylandIntegration()
-    : mClientBufferIntegration(nullptr)
-    , mInputDeviceIntegration(nullptr)
-    , mFontDb(new QGenericUnixFontDatabase())
+    : mFontDb(new QGenericUnixFontDatabase())
     , mNativeInterface(new QWaylandNativeInterface(this))
 #if QT_CONFIG(accessibility)
     , mAccessibility(new QPlatformAccessibility())
 #endif
-    , mClientBufferIntegrationInitialized(false)
-    , mServerBufferIntegrationInitialized(false)
-    , mShellIntegrationInitialized(false)
 {
     initializeInputDeviceIntegration();
     mDisplay.reset(new QWaylandDisplay(this));
diff --git a/src/plugins/platforms/wayland/qwaylandintegration_p.h b/src/plugins/platforms/wayland/qwaylandintegration_p.h
index 17144b8d716..7ce79e6da1e 100644
--- a/src/plugins/platforms/wayland/qwaylandintegration_p.h
+++ b/src/plugins/platforms/wayland/qwaylandintegration_p.h
@@ -147,9 +147,9 @@ private:
     QScopedPointer<QPlatformAccessibility> mAccessibility;
 #endif
     bool mFailed = false;
-    bool mClientBufferIntegrationInitialized;
-    bool mServerBufferIntegrationInitialized;
-    bool mShellIntegrationInitialized;
+    bool mClientBufferIntegrationInitialized = false;
+    bool mServerBufferIntegrationInitialized = false;
+    bool mShellIntegrationInitialized = false;
 
     friend class QWaylandDisplay;
 };
diff --git a/src/plugins/platforms/wayland/qwaylandscreen.cpp b/src/plugins/platforms/wayland/qwaylandscreen.cpp
index 1c9ce23ba43..38d97a91dfb 100644
--- a/src/plugins/platforms/wayland/qwaylandscreen.cpp
+++ b/src/plugins/platforms/wayland/qwaylandscreen.cpp
@@ -53,20 +53,10 @@ QT_BEGIN_NAMESPACE
 namespace QtWaylandClient {
 
 QWaylandScreen::QWaylandScreen(QWaylandDisplay *waylandDisplay, int version, uint32_t id)
-    : QPlatformScreen()
-    , QtWayland::wl_output(waylandDisplay->wl_registry(), id, qMin(version, 2))
+    : QtWayland::wl_output(waylandDisplay->wl_registry(), id, qMin(version, 2))
     , m_outputId(id)
     , mWaylandDisplay(waylandDisplay)
-    , mScale(1)
-    , mDepth(32)
-    , mRefreshRate(60000)
-    , mTransform(-1)
-    , mFormat(QImage::Format_ARGB32_Premultiplied)
     , mOutputName(QStringLiteral("Screen%1").arg(id))
-    , m_orientation(Qt::PrimaryOrientation)
-#if QT_CONFIG(cursor)
-    , mWaylandCursor(nullptr)
-#endif
 {
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylandscreen_p.h b/src/plugins/platforms/wayland/qwaylandscreen_p.h
index 674e1a9134e..37c35cffff4 100644
--- a/src/plugins/platforms/wayland/qwaylandscreen_p.h
+++ b/src/plugins/platforms/wayland/qwaylandscreen_p.h
@@ -116,21 +116,21 @@ private:
     void output_done() override;
 
     int m_outputId;
-    QWaylandDisplay *mWaylandDisplay;
+    QWaylandDisplay *mWaylandDisplay = nullptr;
     QString mManufacturer;
     QString mModel;
     QRect mGeometry;
-    int mScale;
-    int mDepth;
-    int mRefreshRate;
-    int mTransform;
-    QImage::Format mFormat;
+    int mScale = 1;
+    int mDepth = 32;
+    int mRefreshRate = 60000;
+    int mTransform = -1;
+    QImage::Format mFormat = QImage::Format_ARGB32_Premultiplied;
     QSize mPhysicalSize;
     QString mOutputName;
-    Qt::ScreenOrientation m_orientation;
+    Qt::ScreenOrientation m_orientation = Qt::PrimaryOrientation;
 
 #if QT_CONFIG(cursor)
-    QWaylandCursor *mWaylandCursor;
+    QWaylandCursor *mWaylandCursor = nullptr;
 #endif
 };
 
diff --git a/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp b/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
index 24554ee44b4..cbfdf51576e 100644
--- a/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
+++ b/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
@@ -72,9 +72,6 @@ Q_LOGGING_CATEGORY(logCategory, "qt.qpa.wayland.backingstore")
 
 QWaylandShmBuffer::QWaylandShmBuffer(QWaylandDisplay *display,
                      const QSize &size, QImage::Format format, int scale)
-    : QWaylandBuffer()
-    , mShmPool(nullptr)
-    , mMarginsImage(nullptr)
 {
     int stride = size.width() * 4;
     int alloc = stride * size.height();
@@ -161,9 +158,6 @@ QImage *QWaylandShmBuffer::imageInsideMargins(const QMargins &marginsIn)
 QWaylandShmBackingStore::QWaylandShmBackingStore(QWindow *window)
     : QPlatformBackingStore(window)
     , mDisplay(QWaylandScreen::waylandScreenFromWindow(window)->display())
-    , mFrontBuffer(nullptr)
-    , mBackBuffer(nullptr)
-    , mPainting(false)
 {
 
 }
diff --git a/src/plugins/platforms/wayland/qwaylandshmbackingstore_p.h b/src/plugins/platforms/wayland/qwaylandshmbackingstore_p.h
index 251368efd47..628d1858be1 100644
--- a/src/plugins/platforms/wayland/qwaylandshmbackingstore_p.h
+++ b/src/plugins/platforms/wayland/qwaylandshmbackingstore_p.h
@@ -79,9 +79,9 @@ public:
     QImage *imageInsideMargins(const QMargins &margins);
 private:
     QImage mImage;
-    struct wl_shm_pool *mShmPool;
+    struct wl_shm_pool *mShmPool = nullptr;
     QMargins mMargins;
-    QImage *mMarginsImage;
+    QImage *mMarginsImage = nullptr;
 };
 
 class Q_WAYLAND_CLIENT_EXPORT QWaylandShmBackingStore : public QPlatformBackingStore
@@ -115,11 +115,11 @@ private:
     void updateDecorations();
     QWaylandShmBuffer *getBuffer(const QSize &size);
 
-    QWaylandDisplay *mDisplay;
+    QWaylandDisplay *mDisplay = nullptr;
     QLinkedList<QWaylandShmBuffer *> mBuffers;
-    QWaylandShmBuffer *mFrontBuffer;
-    QWaylandShmBuffer *mBackBuffer;
-    bool mPainting;
+    QWaylandShmBuffer *mFrontBuffer = nullptr;
+    QWaylandShmBuffer *mBackBuffer = nullptr;
+    bool mPainting = false;
     QMutex mMutex;
 
     QSize mRequestedSize;
diff --git a/src/plugins/platforms/wayland/qwaylandsubsurface.cpp b/src/plugins/platforms/wayland/qwaylandsubsurface.cpp
index 36fdd1c7a24..2ff966cbc66 100644
--- a/src/plugins/platforms/wayland/qwaylandsubsurface.cpp
+++ b/src/plugins/platforms/wayland/qwaylandsubsurface.cpp
@@ -51,7 +51,6 @@ QWaylandSubSurface::QWaylandSubSurface(QWaylandWindow *window, QWaylandWindow *p
     : QtWayland::wl_subsurface(sub_surface)
     , m_window(window)
     , m_parent(parent)
-    , m_synchronized(false)
 {
     m_parent->mChildren << this;
     setDeSync();
diff --git a/src/plugins/platforms/wayland/qwaylandsubsurface_p.h b/src/plugins/platforms/wayland/qwaylandsubsurface_p.h
index 00fb8d8edab..36a92a7559e 100644
--- a/src/plugins/platforms/wayland/qwaylandsubsurface_p.h
+++ b/src/plugins/platforms/wayland/qwaylandsubsurface_p.h
@@ -88,7 +88,7 @@ private:
     void set_desync();
     QWaylandWindow *m_window;
     QWaylandWindow *m_parent;
-    bool m_synchronized;
+    bool m_synchronized = false;
     QMutex m_syncLock;
 
 };
diff --git a/src/plugins/platforms/wayland/qwaylandwindow.cpp b/src/plugins/platforms/wayland/qwaylandwindow.cpp
index 75dfaa49910..52461dc38bc 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwindow.cpp
@@ -78,25 +78,9 @@ namespace QtWaylandClient {
 QWaylandWindow *QWaylandWindow::mMouseGrab = nullptr;
 
 QWaylandWindow::QWaylandWindow(QWindow *window)
-    : QObject()
-    , QPlatformWindow(window)
+    : QPlatformWindow(window)
     , mDisplay(waylandScreen()->display())
-    , mShellSurface(nullptr)
-    , mSubSurfaceWindow(nullptr)
-    , mWindowDecoration(nullptr)
-    , mMouseEventsInContentArea(false)
-    , mMousePressedInContentArea(Qt::NoButton)
-    , mWaitingForFrameSync(false)
-    , mRequestResizeSent(false)
-    , mCanResize(true)
-    , mResizeDirty(false)
     , mResizeAfterSwap(qEnvironmentVariableIsSet("QT_WAYLAND_RESIZE_AFTER_SWAP"))
-    , mSentInitialResize(false)
-    , mScale(1)
-    , mState(Qt::WindowNoState)
-    , mMask()
-    , mBackingStore(nullptr)
-    , mUpdateRequested(false)
 {
     static WId id = 1;
     mWindowId = id++;
diff --git a/src/plugins/platforms/wayland/qwaylandwindow_p.h b/src/plugins/platforms/wayland/qwaylandwindow_p.h
index fca96f30d50..a74f188274f 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow_p.h
+++ b/src/plugins/platforms/wayland/qwaylandwindow_p.h
@@ -81,9 +81,6 @@ class Q_WAYLAND_CLIENT_EXPORT QWaylandWindowConfigure
 {
 public:
     QWaylandWindowConfigure()
-        : width(0)
-        , height(0)
-        , edges(0)
     { }
 
     void clear()
@@ -92,9 +89,9 @@ public:
     bool isEmpty() const
     { return !height || !width; }
 
-    int width;
-    int height;
-    uint32_t edges;
+    int width = 0;
+    int height = 0;
+    uint32_t edges = 0;
 };
 
 class Q_WAYLAND_CLIENT_EXPORT QWaylandWindow : public QObject, public QPlatformWindow, public QtWayland::wl_surface
@@ -214,39 +211,39 @@ protected:
     void surface_leave(struct ::wl_output *output) override;
 
     QVector<QWaylandScreen *> mScreens; //As seen by wl_surface.enter/leave events. Chronological order.
-    QWaylandDisplay *mDisplay;
-    QWaylandShellSurface *mShellSurface;
-    QWaylandSubSurface *mSubSurfaceWindow;
+    QWaylandDisplay *mDisplay = nullptr;
+    QWaylandShellSurface *mShellSurface = nullptr;
+    QWaylandSubSurface *mSubSurfaceWindow = nullptr;
     QVector<QWaylandSubSurface *> mChildren;
 
-    QWaylandAbstractDecoration *mWindowDecoration;
-    bool mMouseEventsInContentArea;
-    Qt::MouseButtons mMousePressedInContentArea;
+    QWaylandAbstractDecoration *mWindowDecoration = nullptr;
+    bool mMouseEventsInContentArea = false;
+    Qt::MouseButtons mMousePressedInContentArea = Qt::NoButton;
 
     WId mWindowId;
-    bool mWaitingForFrameSync;
+    bool mWaitingForFrameSync = false;
     struct ::wl_callback *mFrameCallback = nullptr;
     QWaitCondition mFrameSyncWait;
 
     QMutex mResizeLock;
     QWaylandWindowConfigure mConfigure;
-    bool mRequestResizeSent;
-    bool mCanResize;
-    bool mResizeDirty;
+    bool mRequestResizeSent = false;
+    bool mCanResize = true;
+    bool mResizeDirty = false;
     bool mResizeAfterSwap;
     QVariantMap m_properties;
 
-    bool mSentInitialResize;
+    bool mSentInitialResize = false;
     QPoint mOffset;
-    int mScale;
+    int mScale = 1;
 
     QIcon mWindowIcon;
 
-    Qt::WindowStates mState;
+    Qt::WindowStates mState = Qt::WindowNoState;
     Qt::WindowFlags mFlags;
     QRegion mMask;
 
-    QWaylandShmBackingStore *mBackingStore;
+    QWaylandShmBackingStore *mBackingStore = nullptr;
 
 private slots:
     void handleScreenRemoved(QScreen *qScreen);
@@ -266,7 +263,7 @@ private:
     void handleMouseEventWithDecoration(QWaylandInputDevice *inputDevice, const QWaylandPointerEvent &e);
     void handleScreenChanged();
 
-    bool mUpdateRequested;
+    bool mUpdateRequested = false;
 
     static const wl_callback_listener callbackListener;
     static void frameCallback(void *data, struct wl_callback *wl_callback, uint32_t time);
diff --git a/src/plugins/platforms/wayland/qwaylandwindowmanagerintegration.cpp b/src/plugins/platforms/wayland/qwaylandwindowmanagerintegration.cpp
index c519126e5a5..785a0a44d7c 100644
--- a/src/plugins/platforms/wayland/qwaylandwindowmanagerintegration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwindowmanagerintegration.cpp
@@ -60,16 +60,14 @@ namespace QtWaylandClient {
 class QWaylandWindowManagerIntegrationPrivate {
 public:
     QWaylandWindowManagerIntegrationPrivate(QWaylandDisplay *waylandDisplay);
-    bool m_blockPropertyUpdates;
+    bool m_blockPropertyUpdates = false;
     QWaylandDisplay *m_waylandDisplay;
     QHash<QWindow*, QVariantMap> m_queuedProperties;
-    bool m_showIsFullScreen;
+    bool m_showIsFullScreen = false;
 };
 
 QWaylandWindowManagerIntegrationPrivate::QWaylandWindowManagerIntegrationPrivate(QWaylandDisplay *waylandDisplay)
-    : m_blockPropertyUpdates(false)
-    , m_waylandDisplay(waylandDisplay)
-    , m_showIsFullScreen(false)
+    : m_waylandDisplay(waylandDisplay)
 {
 
 }
diff --git a/src/plugins/platforms/wayland/qwaylandwlshellintegration.cpp b/src/plugins/platforms/wayland/qwaylandwlshellintegration.cpp
index e516371086e..81c46be29e6 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellintegration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwlshellintegration.cpp
@@ -55,7 +55,6 @@ QWaylandWlShellIntegration *QWaylandWlShellIntegration::create(QWaylandDisplay *
 }
 
 QWaylandWlShellIntegration::QWaylandWlShellIntegration(QWaylandDisplay *display)
-    : m_wlShell(nullptr)
 {
     Q_FOREACH (QWaylandDisplay::RegistryGlobal global, display->globals()) {
         if (global.interface == QLatin1String("wl_shell")) {
diff --git a/src/plugins/platforms/wayland/qwaylandwlshellintegration_p.h b/src/plugins/platforms/wayland/qwaylandwlshellintegration_p.h
index 2e3ac3cc1cf..7a6b53524a9 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellintegration_p.h
+++ b/src/plugins/platforms/wayland/qwaylandwlshellintegration_p.h
@@ -70,7 +70,7 @@ public:
 private:
     QWaylandWlShellIntegration(QWaylandDisplay* display);
 
-    QtWayland::wl_shell *m_wlShell;
+    QtWayland::wl_shell *m_wlShell = nullptr;
 };
 
 }
diff --git a/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp b/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
index 7c8d5172147..00b070f3fd1 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
@@ -56,9 +56,6 @@ QWaylandWlShellSurface::QWaylandWlShellSurface(struct ::wl_shell_surface *shell_
     : QWaylandShellSurface(window)
     , QtWayland::wl_shell_surface(shell_surface)
     , m_window(window)
-    , m_maximized(false)
-    , m_fullscreen(false)
-    , m_extendedWindow(nullptr)
 {
     if (window->display()->windowExtension())
         m_extendedWindow = new QWaylandExtendedSurface(window);
diff --git a/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h b/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h
index 62583949b68..708c6f1132b 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h
+++ b/src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h
@@ -105,10 +105,10 @@ private:
     void setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, uint serial);
 
     QWaylandWindow *m_window;
-    bool m_maximized;
-    bool m_fullscreen;
+    bool m_maximized = false;
+    bool m_fullscreen = false;
     QSize m_size;
-    QWaylandExtendedSurface *m_extendedWindow;
+    QWaylandExtendedSurface *m_extendedWindow = nullptr;
 
     void shell_surface_ping(uint32_t serial) override;
     void shell_surface_configure(uint32_t edges,
diff --git a/src/plugins/platforms/wayland/qwaylandxdgpopup.cpp b/src/plugins/platforms/wayland/qwaylandxdgpopup.cpp
index d5fc4969362..46a12a828a1 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgpopup.cpp
+++ b/src/plugins/platforms/wayland/qwaylandxdgpopup.cpp
@@ -50,7 +50,6 @@ namespace QtWaylandClient {
 QWaylandXdgPopup::QWaylandXdgPopup(struct ::xdg_popup *popup, QWaylandWindow *window)
     : QWaylandShellSurface(window)
     , QtWayland::xdg_popup(popup)
-    , m_extendedWindow(nullptr)
     , m_window(window)
 {
     if (window->display()->windowExtension())
diff --git a/src/plugins/platforms/wayland/qwaylandxdgpopup_p.h b/src/plugins/platforms/wayland/qwaylandxdgpopup_p.h
index f45e717a953..85bd589bf7e 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgpopup_p.h
+++ b/src/plugins/platforms/wayland/qwaylandxdgpopup_p.h
@@ -80,7 +80,7 @@ protected:
     void xdg_popup_popup_done() override;
 
 private:
-    QWaylandExtendedSurface *m_extendedWindow;
+    QWaylandExtendedSurface *m_extendedWindow = nullptr;
     QWaylandWindow *m_window;
 };
 
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshell.cpp b/src/plugins/platforms/wayland/qwaylandxdgshell.cpp
index 6a99306081a..8b252b95323 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshell.cpp
+++ b/src/plugins/platforms/wayland/qwaylandxdgshell.cpp
@@ -54,13 +54,11 @@ namespace QtWaylandClient {
 
 QWaylandXdgShell::QWaylandXdgShell(struct ::xdg_shell *shell)
     : QtWayland::xdg_shell(shell)
-    , m_popupSerial(0)
 {
 }
 
 QWaylandXdgShell::QWaylandXdgShell(struct ::wl_registry *registry, uint32_t id)
     : QtWayland::xdg_shell(registry, id, 1)
-    , m_popupSerial(0)
 {
     use_unstable_version(QtWayland::xdg_shell::version_current);
 }
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshell_p.h b/src/plugins/platforms/wayland/qwaylandxdgshell_p.h
index f462f28281d..e01104cadf3 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshell_p.h
+++ b/src/plugins/platforms/wayland/qwaylandxdgshell_p.h
@@ -85,7 +85,7 @@ private:
     void xdg_shell_ping(uint32_t serial) override;
 
     QVector<QWaylandWindow *> m_popups;
-    uint m_popupSerial;
+    uint m_popupSerial = 0;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshellintegration.cpp b/src/plugins/platforms/wayland/qwaylandxdgshellintegration.cpp
index 7c40d2dd7fb..5fa4385d65b 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshellintegration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandxdgshellintegration.cpp
@@ -57,7 +57,6 @@ QWaylandXdgShellIntegration *QWaylandXdgShellIntegration::create(QWaylandDisplay
 }
 
 QWaylandXdgShellIntegration::QWaylandXdgShellIntegration(QWaylandDisplay *display)
-    : m_xdgShell(nullptr)
 {
     Q_FOREACH (QWaylandDisplay::RegistryGlobal global, display->globals()) {
         if (global.interface == QLatin1String("xdg_shell")) {
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshellintegration_p.h b/src/plugins/platforms/wayland/qwaylandxdgshellintegration_p.h
index cc4493e3e1b..ed307a5de8b 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshellintegration_p.h
+++ b/src/plugins/platforms/wayland/qwaylandxdgshellintegration_p.h
@@ -72,7 +72,7 @@ public:
 private:
     QWaylandXdgShellIntegration(QWaylandDisplay *display);
 
-    QWaylandXdgShell *m_xdgShell;
+    QWaylandXdgShell *m_xdgShell = nullptr;
 };
 
 }
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshellv6.cpp b/src/plugins/platforms/wayland/qwaylandxdgshellv6.cpp
index 1a60d65333f..69bbf55b866 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshellv6.cpp
+++ b/src/plugins/platforms/wayland/qwaylandxdgshellv6.cpp
@@ -117,9 +117,6 @@ QWaylandXdgSurfaceV6::QWaylandXdgSurfaceV6(QWaylandXdgShellV6 *shell, ::zxdg_sur
                     , zxdg_surface_v6(surface)
                     , m_shell(shell)
                     , m_window(window)
-                    , m_toplevel(nullptr)
-                    , m_popup(nullptr)
-                    , m_configured(false)
 {
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshellv6_p.h b/src/plugins/platforms/wayland/qwaylandxdgshellv6_p.h
index 769f19837b4..122beed0c8c 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshellv6_p.h
+++ b/src/plugins/platforms/wayland/qwaylandxdgshellv6_p.h
@@ -125,9 +125,9 @@ private:
 
     QWaylandXdgShellV6 *m_shell;
     QWaylandWindow *m_window;
-    Toplevel *m_toplevel;
-    Popup *m_popup;
-    bool m_configured;
+    Toplevel *m_toplevel = nullptr;
+    Popup *m_popup = nullptr;
+    bool m_configured = false;
     QRegion m_exposeRegion;
 };
 
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshellv6integration.cpp b/src/plugins/platforms/wayland/qwaylandxdgshellv6integration.cpp
index a3dca70bf56..cb82354b64c 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshellv6integration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandxdgshellv6integration.cpp
@@ -51,7 +51,6 @@ QT_BEGIN_NAMESPACE
 namespace QtWaylandClient {
 
 QWaylandXdgShellV6Integration::QWaylandXdgShellV6Integration(QWaylandDisplay *display)
-    : m_xdgShell(nullptr)
 {
     for (QWaylandDisplay::RegistryGlobal global : display->globals()) {
         if (global.interface == QLatin1String("zxdg_shell_v6")) {
diff --git a/src/plugins/platforms/wayland/qwaylandxdgshellv6integration_p.h b/src/plugins/platforms/wayland/qwaylandxdgshellv6integration_p.h
index f22b6a66adf..bdfd1972338 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgshellv6integration_p.h
+++ b/src/plugins/platforms/wayland/qwaylandxdgshellv6integration_p.h
@@ -71,7 +71,7 @@ public:
 private:
     QWaylandXdgShellV6Integration(QWaylandDisplay *display);
 
-    QWaylandXdgShellV6 *m_xdgShell;
+    QWaylandXdgShellV6 *m_xdgShell = nullptr;
 };
 
 }
diff --git a/src/plugins/platforms/wayland/qwaylandxdgsurface.cpp b/src/plugins/platforms/wayland/qwaylandxdgsurface.cpp
index 60266af689d..40ed9f07aa1 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgsurface.cpp
+++ b/src/plugins/platforms/wayland/qwaylandxdgsurface.cpp
@@ -57,11 +57,6 @@ QWaylandXdgSurface::QWaylandXdgSurface(QWaylandXdgShell *shell, QWaylandWindow *
     , QtWayland::xdg_surface(shell->get_xdg_surface(window->object()))
     , m_window(window)
     , m_shell(shell)
-    , m_maximized(false)
-    , m_minimized(false)
-    , m_fullscreen(false)
-    , m_active(false)
-    , m_extendedWindow(nullptr)
 {
     if (window->display()->windowExtension())
         m_extendedWindow = new QWaylandExtendedSurface(window);
diff --git a/src/plugins/platforms/wayland/qwaylandxdgsurface_p.h b/src/plugins/platforms/wayland/qwaylandxdgsurface_p.h
index 00154ade072..fa79632068a 100644
--- a/src/plugins/platforms/wayland/qwaylandxdgsurface_p.h
+++ b/src/plugins/platforms/wayland/qwaylandxdgsurface_p.h
@@ -112,13 +112,13 @@ private:
 private:
     QWaylandWindow *m_window;
     QWaylandXdgShell* m_shell;
-    bool m_maximized;
-    bool m_minimized;
-    bool m_fullscreen;
-    bool m_active;
+    bool m_maximized = false;
+    bool m_minimized = false;
+    bool m_fullscreen = false;
+    bool m_active = false;
     QSize m_normalSize;
     QMargins m_margins;
-    QWaylandExtendedSurface *m_extendedWindow;
+    QWaylandExtendedSurface *m_extendedWindow = nullptr;
 
     void xdg_surface_configure(int32_t width,
                                int32_t height,
diff --git a/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder.cpp b/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder.cpp
index 6acf312ed59..88056637df9 100644
--- a/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder.cpp
+++ b/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder.cpp
@@ -50,16 +50,6 @@
 
 QT_BEGIN_NAMESPACE
 
-QWaylandInputMethodEventBuilder::QWaylandInputMethodEventBuilder()
-    : m_anchor(0)
-    , m_cursor(0)
-    , m_deleteBefore(0)
-    , m_deleteAfter(0)
-    , m_preeditCursor(0)
-    , m_preeditStyles()
-{
-}
-
 QWaylandInputMethodEventBuilder::~QWaylandInputMethodEventBuilder()
 {
 }
diff --git a/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder_p.h b/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder_p.h
index 3912afc0424..a234cf44be8 100644
--- a/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder_p.h
+++ b/src/plugins/platforms/wayland/shared/qwaylandinputmethodeventbuilder_p.h
@@ -47,7 +47,7 @@ QT_BEGIN_NAMESPACE
 class QWaylandInputMethodEventBuilder
 {
 public:
-    QWaylandInputMethodEventBuilder();
+    QWaylandInputMethodEventBuilder() = default;
     ~QWaylandInputMethodEventBuilder();
 
     void reset();
@@ -66,12 +66,12 @@ public:
 private:
     QPair<int, int> replacementForDeleteSurrounding();
 
-    int32_t m_anchor;
-    int32_t m_cursor;
-    uint32_t m_deleteBefore;
-    uint32_t m_deleteAfter;
+    int32_t m_anchor = 0;
+    int32_t m_cursor = 0;
+    uint32_t m_deleteBefore = 0;
+    uint32_t m_deleteAfter = 0;
 
-    int32_t m_preeditCursor;
+    int32_t m_preeditCursor = 0;
     QList<QInputMethodEvent::Attribute> m_preeditStyles;
 };
 
diff --git a/tests/auto/wayland/client/tst_client.cpp b/tests/auto/wayland/client/tst_client.cpp
index eb99b2e2f5f..8ee52d7364f 100644
--- a/tests/auto/wayland/client/tst_client.cpp
+++ b/tests/auto/wayland/client/tst_client.cpp
@@ -48,14 +48,6 @@ class TestWindow : public QWindow
 {
 public:
     TestWindow()
-        : focusInEventCount(0)
-        , focusOutEventCount(0)
-        , keyPressEventCount(0)
-        , keyReleaseEventCount(0)
-        , mousePressEventCount(0)
-        , mouseReleaseEventCount(0)
-        , touchEventCount(0)
-        , keyCode(0)
     {
         setSurfaceType(QSurface::RasterSurface);
         setGeometry(0, 0, 32, 32);
@@ -103,15 +95,15 @@ public:
 
     QPoint frameOffset() const { return QPoint(frameMargins().left(), frameMargins().top()); }
 
-    int focusInEventCount;
-    int focusOutEventCount;
-    int keyPressEventCount;
-    int keyReleaseEventCount;
-    int mousePressEventCount;
-    int mouseReleaseEventCount;
-    int touchEventCount;
+    int focusInEventCount = 0;
+    int focusOutEventCount = 0;
+    int keyPressEventCount = 0;
+    int keyReleaseEventCount = 0;
+    int mousePressEventCount = 0;
+    int mouseReleaseEventCount = 0;
+    int touchEventCount = 0;
 
-    uint keyCode;
+    uint keyCode = 0;
     QPoint mousePressPos;
 };
 
@@ -404,7 +396,6 @@ class DndWindow : public QWindow
 public:
     DndWindow(QWindow *parent = nullptr)
         : QWindow(parent)
-        , dragStarted(false)
     {
         QImage cursorImage(64,64,QImage::Format_ARGB32);
         cursorImage.fill(Qt::blue);
@@ -412,7 +403,7 @@ public:
     }
     ~DndWindow(){}
     QPoint frameOffset() const { return QPoint(frameMargins().left(), frameMargins().top()); }
-    bool dragStarted;
+    bool dragStarted = false;
 
 protected:
     void mousePressEvent(QMouseEvent *event) override
diff --git a/tests/auto/wayland/shared/mockcompositor.cpp b/tests/auto/wayland/shared/mockcompositor.cpp
index 2f1d68b0147..1d76cec1200 100644
--- a/tests/auto/wayland/shared/mockcompositor.cpp
+++ b/tests/auto/wayland/shared/mockcompositor.cpp
@@ -37,9 +37,6 @@
 
 #include <stdio.h>
 MockCompositor::MockCompositor()
-    : m_alive(true)
-    , m_ready(false)
-    , m_compositor(0)
 {
     pthread_create(&m_thread, 0, run, this);
 
diff --git a/tests/auto/wayland/shared/mockcompositor.h b/tests/auto/wayland/shared/mockcompositor.h
index 747da38fa06..c6de12376a3 100644
--- a/tests/auto/wayland/shared/mockcompositor.h
+++ b/tests/auto/wayland/shared/mockcompositor.h
@@ -212,13 +212,13 @@ private:
 
     static void *run(void *data);
 
-    bool m_alive;
-    bool m_ready;
+    bool m_alive = true;
+    bool m_ready = false;
     pthread_t m_thread;
     QMutex m_mutex;
     QWaitCondition m_waitCondition;
 
-    Impl::Compositor *m_compositor;
+    Impl::Compositor *m_compositor = nullptr;
 
     QList<Command> m_commandQueue;
 };
diff --git a/tests/auto/wayland/shared/mockinput.cpp b/tests/auto/wayland/shared/mockinput.cpp
index 9cea85b6d12..8b7592824d7 100644
--- a/tests/auto/wayland/shared/mockinput.cpp
+++ b/tests/auto/wayland/shared/mockinput.cpp
@@ -232,10 +232,7 @@ void Seat::seat_get_touch(Resource *resource, uint32_t id)
 }
 
 Keyboard::Keyboard(Compositor *compositor)
-    : wl_keyboard()
-    , m_compositor(compositor)
-    , m_focusResource(nullptr)
-    , m_focus(nullptr)
+    : m_compositor(compositor)
 {
 }
 
@@ -286,10 +283,7 @@ void Keyboard::keyboard_destroy_resource(wl_keyboard::Resource *resource)
 }
 
 Pointer::Pointer(Compositor *compositor)
-    : wl_pointer()
-    , m_compositor(compositor)
-    , m_focusResource(nullptr)
-    , m_focus(nullptr)
+    : m_compositor(compositor)
 {
 }
 
@@ -393,10 +387,7 @@ DataOffer::DataOffer()
 }
 
 DataDevice::DataDevice(Compositor *compositor)
-    : wl_data_device()
-    , m_compositor(compositor)
-    , m_dataOffer(nullptr)
-    , m_focus(nullptr)
+    : m_compositor(compositor)
 {
 
 }
diff --git a/tests/auto/wayland/shared/mockinput.h b/tests/auto/wayland/shared/mockinput.h
index 9c217b6acd2..5760ab40c63 100644
--- a/tests/auto/wayland/shared/mockinput.h
+++ b/tests/auto/wayland/shared/mockinput.h
@@ -85,8 +85,8 @@ protected:
 private:
     Compositor *m_compositor;
 
-    Resource *m_focusResource;
-    Surface *m_focus;
+    Resource *m_focusResource = nullptr;
+    Surface *m_focus = nullptr;
 };
 
 class Pointer : public QtWaylandServer::wl_pointer
@@ -108,8 +108,8 @@ protected:
 private:
     Compositor *m_compositor;
 
-    Resource *m_focusResource;
-    Surface *m_focus;
+    Resource *m_focusResource = nullptr;
+    Surface *m_focus = nullptr;
 };
 
 class Touch : public QtWaylandServer::wl_touch
@@ -146,8 +146,8 @@ protected:
 
 private:
     Compositor *m_compositor;
-    QtWaylandServer::wl_data_offer *m_dataOffer;
-    Surface* m_focus;
+    QtWaylandServer::wl_data_offer *m_dataOffer = nullptr;
+    Surface* m_focus = nullptr;
 };
 
 class DataDeviceManager : public QtWaylandServer::wl_data_device_manager
diff --git a/tests/auto/wayland/shared/mocksurface.cpp b/tests/auto/wayland/shared/mocksurface.cpp
index 7aa2a00b2da..98a9615a624 100644
--- a/tests/auto/wayland/shared/mocksurface.cpp
+++ b/tests/auto/wayland/shared/mocksurface.cpp
@@ -62,10 +62,8 @@ void Compositor::sendSurfaceLeave(void *data, const QList<QVariant> &parameters)
 
 Surface::Surface(wl_client *client, uint32_t id, int v, Compositor *compositor)
     : QtWaylandServer::wl_surface(client, id, v)
-    , m_buffer(nullptr)
     , m_compositor(compositor)
     , m_mockSurface(new MockSurface(this))
-    , m_mapped(false)
 {
 }
 
diff --git a/tests/auto/wayland/shared/mocksurface.h b/tests/auto/wayland/shared/mocksurface.h
index 5155599bbfa..8bf6eb755a2 100644
--- a/tests/auto/wayland/shared/mocksurface.h
+++ b/tests/auto/wayland/shared/mocksurface.h
@@ -63,12 +63,12 @@ protected:
                        uint32_t callback) override;
     void surface_commit(Resource *resource) override;
 private:
-    wl_resource *m_buffer;
+    wl_resource *m_buffer = nullptr;
 
     Compositor *m_compositor;
     QSharedPointer<MockSurface> m_mockSurface;
     QList<wl_resource *> m_frameCallbackList;
-    bool m_mapped;
+    bool m_mapped = false;
 };
 
 }