diff --git a/src/platformsupport/input/evdevtouch/qevdevtouch.cpp b/src/platformsupport/input/evdevtouch/qevdevtouch.cpp
index 5215f7da0a4..5c28dfb0827 100644
--- a/src/platformsupport/input/evdevtouch/qevdevtouch.cpp
+++ b/src/platformsupport/input/evdevtouch/qevdevtouch.cpp
@@ -175,7 +175,7 @@ QEvdevTouchScreenHandler::QEvdevTouchScreenHandler(const QString &specification,
     setObjectName(QLatin1String("Evdev Touch Handler"));
 
     if (qEnvironmentVariableIsSet("QT_QPA_EVDEV_DEBUG"))
-        ((QLoggingCategory &) qLcEvdevTouch()).setEnabled(QtDebugMsg, true);
+        const_cast<QLoggingCategory &>(qLcEvdevTouch()).setEnabled(QtDebugMsg, true);
 
     // only the first device argument is used for now
     QString spec = QString::fromLocal8Bit(qgetenv("QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS"));
diff --git a/src/plugins/imageformats/ico/qicohandler.cpp b/src/plugins/imageformats/ico/qicohandler.cpp
index 6e5b81ed369..ab03bfeb04e 100644
--- a/src/plugins/imageformats/ico/qicohandler.cpp
+++ b/src/plugins/imageformats/ico/qicohandler.cpp
@@ -524,7 +524,7 @@ QImage ICOReader::iconAt(int index)
 
             iod->seek(iconEntry.dwImageOffset);
 
-            const QByteArray pngMagic = QByteArray::fromRawData((char*)pngMagicData, sizeof(pngMagicData));
+            const QByteArray pngMagic = QByteArray::fromRawData((const char*)pngMagicData, sizeof(pngMagicData));
             const bool isPngImage = (iod->read(pngMagic.size()) == pngMagic);
 
             if (isPngImage) {
diff --git a/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp b/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp
index ad226989a04..49fa32004e1 100644
--- a/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp
+++ b/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp
@@ -97,7 +97,7 @@ bool QComposeInputContext::filterEvent(const QEvent *event)
     if ((m_tableState & TableGenerator::NoErrors) != TableGenerator::NoErrors)
         return false;
 
-    QKeyEvent *keyEvent = (QKeyEvent *)event;
+    const QKeyEvent *keyEvent = (const QKeyEvent *)event;
     // should pass only the key presses
     if (keyEvent->type() != QEvent::KeyPress) {
         return false;
diff --git a/src/plugins/platforms/xcb/qxcbclipboard.cpp b/src/plugins/platforms/xcb/qxcbclipboard.cpp
index d4f1c6ae480..2c0a7a11cce 100644
--- a/src/plugins/platforms/xcb/qxcbclipboard.cpp
+++ b/src/plugins/platforms/xcb/qxcbclipboard.cpp
@@ -97,7 +97,7 @@ protected:
             that->format_atoms = m_clipboard->getDataInFormat(modeAtom, m_clipboard->atom(QXcbAtom::TARGETS));
 
             if (format_atoms.size() > 0) {
-                xcb_atom_t *targets = (xcb_atom_t *) format_atoms.data();
+                const xcb_atom_t *targets = (const xcb_atom_t *) format_atoms.data();
                 int size = format_atoms.size() / sizeof(xcb_atom_t);
 
                 for (int i = 0; i < size; ++i) {
@@ -128,7 +128,7 @@ protected:
         (void)formats(); // trigger update of format list
 
         QVector<xcb_atom_t> atoms;
-        xcb_atom_t *targets = (xcb_atom_t *) format_atoms.data();
+        const xcb_atom_t *targets = (const xcb_atom_t *) format_atoms.data();
         int size = format_atoms.size() / sizeof(xcb_atom_t);
         atoms.reserve(size);
         for (int i = 0; i < size; ++i)
diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp
index 78ced43af82..08108f1e204 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.cpp
+++ b/src/plugins/platforms/xcb/qxcbscreen.cpp
@@ -703,7 +703,7 @@ Q_XCB_EXPORT QDebug operator<<(QDebug debug, const QXcbScreen *screen)
 {
     const QDebugStateSaver saver(debug);
     debug.nospace();
-    debug << "QXcbScreen(" << (void *)screen;
+    debug << "QXcbScreen(" << (const void *)screen;
     if (screen) {
         debug << fixed << qSetRealNumberPrecision(1);
         debug << ", name=" << screen->name();
diff --git a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
index 33e67a14b10..328b72234a9 100644
--- a/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
+++ b/src/plugins/platforms/xcb/qxcbsessionmanager.cpp
@@ -125,7 +125,7 @@ static void sm_setProperty(const QString &name, const QString &value)
     QByteArray v = value.toUtf8();
     SmPropValue prop;
     prop.length = v.length();
-    prop.value = (SmPointer) v.constData();
+    prop.value = (SmPointer) const_cast<char *>(v.constData());
     sm_setProperty(name.toLatin1().data(), SmARRAY8, 1, &prop);
 }