diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
index 9211fd1320..4abeb4c1ce 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
@@ -1604,8 +1604,8 @@ class QWindowsFileDialogHelper : public QWindowsDialogHelperBase<QPlatformFileDi
 {
 public:
     QWindowsFileDialogHelper() {}
-    virtual bool supportsNonModalDialog(const QWindow * /* parent */ = 0) const { return false; }
-    virtual bool defaultNameFilterDisables() const
+    virtual bool supportsNonModalDialog(const QWindow * /* parent */ = 0) const Q_DECL_OVERRIDE { return false; }
+    virtual bool defaultNameFilterDisables() const Q_DECL_OVERRIDE
         { return false; }
     virtual void setDirectory(const QUrl &directory) Q_DECL_OVERRIDE;
     virtual QUrl directory() const Q_DECL_OVERRIDE;
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.h b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
index e0474fc456..2bc823452a 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.h
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
@@ -64,9 +64,9 @@ public:
     ~QWindowsDialogHelperBase() { cleanupThread(); }
 
     void exec() Q_DECL_OVERRIDE;
-    virtual bool show(Qt::WindowFlags windowFlags,
+    bool show(Qt::WindowFlags windowFlags,
                           Qt::WindowModality windowModality,
-                          QWindow *parent);
+                          QWindow *parent) Q_DECL_OVERRIDE;
     void hide() Q_DECL_OVERRIDE;
 
     virtual bool supportsNonModalDialog(const QWindow * /* parent */ = 0) const { return true; }
@@ -75,7 +75,7 @@ protected:
     QWindowsDialogHelperBase();
     QWindowsNativeDialogBase *nativeDialog() const;
     inline bool hasNativeDialog() const { return m_nativeDialog; }
-    void timerEvent(QTimerEvent *);
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;
 
 private:
     virtual QWindowsNativeDialogBase *createNativeDialog() = 0;
diff --git a/src/plugins/platforms/windows/qwindowseglcontext.h b/src/plugins/platforms/windows/qwindowseglcontext.h
index 555d633a78..7a74a2c76f 100644
--- a/src/plugins/platforms/windows/qwindowseglcontext.h
+++ b/src/plugins/platforms/windows/qwindowseglcontext.h
@@ -257,9 +257,9 @@ public:
 
     EGLDisplay display() const { return m_display; }
 
-    QWindowsOpenGLContext *createContext(QOpenGLContext *context);
-    void *moduleHandle() const { return libGLESv2.moduleHandle(); }
-    QOpenGLContext::OpenGLModuleType moduleType() const { return QOpenGLContext::LibGLES; }
+    QWindowsOpenGLContext *createContext(QOpenGLContext *context) Q_DECL_OVERRIDE;
+    void *moduleHandle() const Q_DECL_OVERRIDE { return libGLESv2.moduleHandle(); }
+    QOpenGLContext::OpenGLModuleType moduleType() const Q_DECL_OVERRIDE { return QOpenGLContext::LibGLES; }
 
     void *createWindowSurface(void *nativeWindow, void *nativeConfig, int *err) Q_DECL_OVERRIDE;
     void destroyWindowSurface(void *nativeSurface) Q_DECL_OVERRIDE;