diff --git a/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h b/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h
index 7439087d885..632429befa3 100644
--- a/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h
+++ b/src/plugins/platforms/wayland/hardwareintegration/qwaylandserverbufferintegration_p.h
@@ -85,7 +85,7 @@ public:
     void *userData() const;
 
 protected:
-    Format m_format;
+    Format m_format = RGBA32;
     QSize m_size;
 
 private:
diff --git a/src/plugins/platforms/wayland/qwaylanddisplay_p.h b/src/plugins/platforms/wayland/qwaylanddisplay_p.h
index e9439d1be85..41ad7025fb1 100644
--- a/src/plugins/platforms/wayland/qwaylanddisplay_p.h
+++ b/src/plugins/platforms/wayland/qwaylanddisplay_p.h
@@ -224,10 +224,10 @@ private:
     QScopedPointer<QWaylandHardwareIntegration> mHardwareIntegration;
     QScopedPointer<QtWayland::zxdg_output_manager_v1> mXdgOutputManager;
     QSocketNotifier *mReadNotifier = nullptr;
-    int mFd;
-    int mWritableNotificationFd;
+    int mFd = -1;
+    int mWritableNotificationFd = -1;
     QList<RegistryGlobal> mGlobals;
-    int mCompositorVersion;
+    int mCompositorVersion = -1;
     uint32_t mLastInputSerial = 0;
     QWaylandInputDevice *mLastInputDevice = nullptr;
     QPointer<QWaylandWindow> mLastInputWindow;