diff --git a/autotests/kmainwindow_unittest.cpp b/autotests/kmainwindow_unittest.cpp
index 77fe383f..5736c776 100644
--- a/autotests/kmainwindow_unittest.cpp
+++ b/autotests/kmainwindow_unittest.cpp
@@ -102,7 +102,7 @@ public:
         m_queryClosedCalled = true;
         return true;
     }
-    ~MyMainWindow()
+    ~MyMainWindow() override
     {
         s_mainWindowDeleted = true;
     }
diff --git a/src/kaboutapplicationdialog.h b/src/kaboutapplicationdialog.h
index 451c0a5e..c5af92f3 100644
--- a/src/kaboutapplicationdialog.h
+++ b/src/kaboutapplicationdialog.h
@@ -100,7 +100,7 @@ public:
      */
     explicit KAboutApplicationDialog(const KAboutData &aboutData, QWidget *parent = nullptr);
 
-    virtual ~KAboutApplicationDialog();
+    ~KAboutApplicationDialog() override;
 
 private:
     std::unique_ptr<class KAboutApplicationDialogPrivate> const d;
diff --git a/src/kactioncategory.h b/src/kactioncategory.h
index 36df8431..b899302e 100644
--- a/src/kactioncategory.h
+++ b/src/kactioncategory.h
@@ -96,7 +96,7 @@ public:
     /**
      * Destructor
      */
-    virtual ~KActionCategory();
+    ~KActionCategory() override;
 
     /**
      * \name Adding Actions
diff --git a/src/kedittoolbar_p.h b/src/kedittoolbar_p.h
index ccaed232..d063d844 100644
--- a/src/kedittoolbar_p.h
+++ b/src/kedittoolbar_p.h
@@ -151,7 +151,7 @@ public:
      * @em NOT be saved in the destructor.  You @em must call save()
      * to do that.
      */
-    virtual ~KEditToolBarWidget();
+    ~KEditToolBarWidget() override;
 
     /**
      * Old-style load.
diff --git a/src/khelpmenu.h b/src/khelpmenu.h
index c2309efa..e254b45b 100644
--- a/src/khelpmenu.h
+++ b/src/khelpmenu.h
@@ -143,7 +143,7 @@ public:
      *
      * Destroys dialogs and the menu pointer returned by menu
      */
-    ~KHelpMenu();
+    ~KHelpMenu() override;
 
     /**
      * Returns a popup menu you can use in the menu bar or where you
diff --git a/src/kkeysequencewidget.h b/src/kkeysequencewidget.h
index 90dcdfa7..ab370014 100644
--- a/src/kkeysequencewidget.h
+++ b/src/kkeysequencewidget.h
@@ -65,7 +65,7 @@ public:
     /**
      * Destructs the widget.
      */
-    virtual ~KKeySequenceWidget();
+    ~KKeySequenceWidget() override;
 
     /**
      * \name Configuration
diff --git a/src/kmainwindow_p.h b/src/kmainwindow_p.h
index c1b77721..3284a952 100644
--- a/src/kmainwindow_p.h
+++ b/src/kmainwindow_p.h
@@ -81,7 +81,7 @@ class KMWSessionManager : public QObject
     Q_OBJECT
 public:
     KMWSessionManager();
-    ~KMWSessionManager();
+    ~KMWSessionManager() override;
 
 private Q_SLOTS:
     void saveState(QSessionManager &);
diff --git a/src/kmainwindowiface_p.h b/src/kmainwindowiface_p.h
index 86b57b98..e65cc689 100644
--- a/src/kmainwindowiface_p.h
+++ b/src/kmainwindowiface_p.h
@@ -37,7 +37,7 @@ public:
     Destructor
     Cleans up the dcop action proxy object.
     **/
-    ~KMainWindowInterface();
+    ~KMainWindowInterface() override;
 
 public Q_SLOTS:
     /**
diff --git a/src/ksendbugmail/smtp.h b/src/ksendbugmail/smtp.h
index 8697bca5..49cd6776 100644
--- a/src/ksendbugmail/smtp.h
+++ b/src/ksendbugmail/smtp.h
@@ -47,7 +47,7 @@ class SMTP : public QObject
     Q_OBJECT
 public:
     explicit SMTP(char *serverhost = nullptr, unsigned short int port = 0, int timeout = DEFAULT_SMTP_TIMEOUT);
-    ~SMTP();
+    ~SMTP() override;
 
     void setServerHost(const QString &serverhost);
     void setPort(unsigned short int port);
diff --git a/src/kshortcutsdialog_p.h b/src/kshortcutsdialog_p.h
index 59ae2439..78df18d3 100644
--- a/src/kshortcutsdialog_p.h
+++ b/src/kshortcutsdialog_p.h
@@ -269,7 +269,7 @@ public:
      *
      * Will undo pending changes. If you don't want that. Call commitChanges before
      */
-    virtual ~KShortcutsEditorItem();
+    ~KShortcutsEditorItem() override;
 
     //! Undo the changes since the last commit.
     void undo();
diff --git a/src/kshortcutseditor.h b/src/kshortcutseditor.h
index 62e21f2b..f03a0b82 100644
--- a/src/kshortcutseditor.h
+++ b/src/kshortcutseditor.h
@@ -109,7 +109,7 @@ public:
     explicit KShortcutsEditor(QWidget *parent, ActionTypes actionTypes = AllActions, LetterShortcuts allowLetterShortcuts = LetterShortcutsAllowed);
 
     /// Destructor
-    virtual ~KShortcutsEditor();
+    ~KShortcutsEditor() override;
 
     /**
      * Are the unsaved changes?
diff --git a/src/kshortcutwidget.h b/src/kshortcutwidget.h
index 2db38ed7..c7868fa8 100644
--- a/src/kshortcutwidget.h
+++ b/src/kshortcutwidget.h
@@ -28,7 +28,7 @@ class KXMLGUI_EXPORT KShortcutWidget : public QWidget
     Q_PROPERTY(bool modifierlessAllowed READ isModifierlessAllowed WRITE setModifierlessAllowed)
 public:
     KShortcutWidget(QWidget *parent = nullptr);
-    ~KShortcutWidget();
+    ~KShortcutWidget() override;
 
     void setModifierlessAllowed(bool allow);
     bool isModifierlessAllowed();
diff --git a/src/kswitchlanguagedialog_p.h b/src/kswitchlanguagedialog_p.h
index c4a0c95d..d4551ccd 100644
--- a/src/kswitchlanguagedialog_p.h
+++ b/src/kswitchlanguagedialog_p.h
@@ -49,7 +49,7 @@ public:
      */
     explicit KSwitchLanguageDialog(QWidget *parent = nullptr);
 
-    virtual ~KSwitchLanguageDialog();
+    ~KSwitchLanguageDialog() override;
 
 protected Q_SLOTS:
     /**
diff --git a/src/ktoolbar.h b/src/ktoolbar.h
index 524adc0f..f7a9502d 100644
--- a/src/ktoolbar.h
+++ b/src/ktoolbar.h
@@ -119,7 +119,7 @@ public:
     /**
      * Destroys the toolbar.
      */
-    virtual ~KToolBar();
+    ~KToolBar() override;
 
     /**
      * Returns the main window that this toolbar is docked with.
diff --git a/src/ktoolbarhandler_p.h b/src/ktoolbarhandler_p.h
index 52972c92..3b59134c 100644
--- a/src/ktoolbarhandler_p.h
+++ b/src/ktoolbarhandler_p.h
@@ -36,7 +36,7 @@ public:
     /**
      * Destroys the tool bar handler.
      */
-    virtual ~ToolBarHandler();
+    ~ToolBarHandler() override;
 
     /**
      * Returns the action which is responsible for the tool bar menu.
diff --git a/src/ktooltiphelper.h b/src/ktooltiphelper.h
index 8eff4835..aff696a3 100644
--- a/src/ktooltiphelper.h
+++ b/src/ktooltiphelper.h
@@ -97,7 +97,7 @@ public:
 private:
     explicit KToolTipHelper(QObject *parent);
 
-    virtual ~KToolTipHelper();
+    ~KToolTipHelper() override;
 
 private:
     std::unique_ptr<KToolTipHelperPrivate> const d;
diff --git a/src/ktooltiphelper_p.h b/src/ktooltiphelper_p.h
index e6c8a628..4a4f6ac7 100644
--- a/src/ktooltiphelper_p.h
+++ b/src/ktooltiphelper_p.h
@@ -37,7 +37,7 @@ public:
 
     explicit KToolTipHelperPrivate(KToolTipHelper *qq);
 
-    virtual ~KToolTipHelperPrivate();
+    ~KToolTipHelperPrivate() override;
 
     /** @see KToolTipHelper::eventFilter() */
     virtual bool eventFilter(QObject* watched, QEvent* event) override;
diff --git a/src/kxmlguifactory.h b/src/kxmlguifactory.h
index e7ccb3d2..51c7218d 100644
--- a/src/kxmlguifactory.h
+++ b/src/kxmlguifactory.h
@@ -69,7 +69,7 @@ public:
     /**
      * Destructor
      */
-    ~KXMLGUIFactory();
+    ~KXMLGUIFactory() override;
 
     // XXX move to somewhere else? (Simon)
     /// @internal
diff --git a/tests/kmainwindowrestoretest.h b/tests/kmainwindowrestoretest.h
index affb9b94..64b6e192 100644
--- a/tests/kmainwindowrestoretest.h
+++ b/tests/kmainwindowrestoretest.h
@@ -11,7 +11,7 @@ public:
         : KMainWindow()
     {
     }
-    virtual ~MainWin1()
+    ~MainWin1() override
     {
     }
 };
@@ -24,7 +24,7 @@ public:
         : KMainWindow()
     {
     }
-    virtual ~MainWin2()
+    ~MainWin2() override
     {
     }
 };
@@ -37,7 +37,7 @@ public:
         : KMainWindow()
     {
     }
-    virtual ~MainWin3()
+    ~MainWin3() override
     {
     }
 };
@@ -50,7 +50,7 @@ public:
         : KMainWindow()
     {
     }
-    virtual ~MainWin4()
+    ~MainWin4() override
     {
     }
 };
@@ -63,7 +63,7 @@ public:
         : KMainWindow()
     {
     }
-    virtual ~MainWin5()
+    ~MainWin5() override
     {
     }
 };
@@ -76,7 +76,7 @@ public:
         : KMainWindow()
     {
     }
-    virtual ~MainWin6()
+    ~MainWin6() override
     {
     }
 };
diff --git a/tests/krichtexteditor/krichtexteditor.h b/tests/krichtexteditor/krichtexteditor.h
index 9d029121..63f35325 100644
--- a/tests/krichtexteditor/krichtexteditor.h
+++ b/tests/krichtexteditor/krichtexteditor.h
@@ -25,7 +25,7 @@ class KRichTextEditor : public KXmlGuiWindow
     Q_OBJECT
 public:
     KRichTextEditor();
-    ~KRichTextEditor();
+    ~KRichTextEditor() override;
 
     void setupActions();
 
diff --git a/tests/krulertest.h b/tests/krulertest.h
index 3e6b1d87..b828ec6b 100644
--- a/tests/krulertest.h
+++ b/tests/krulertest.h
@@ -42,7 +42,7 @@ class KRulerTest : public QWidget
     Q_OBJECT
 public:
     KRulerTest();
-    ~KRulerTest();
+    ~KRulerTest() override;
 
 private Q_SLOTS:
     void slotNewWidth(int);
diff --git a/tests/kwindowtest.h b/tests/kwindowtest.h
index 61c95721..09566437 100644
--- a/tests/kwindowtest.h
+++ b/tests/kwindowtest.h
@@ -18,7 +18,7 @@ class TestWindow : public KXmlGuiWindow
 
 public:
     TestWindow(QWidget *parent = nullptr);
-    ~TestWindow();
+    ~TestWindow() override;
 
 public Q_SLOTS:
     void beFixed();