diff --git a/agents/mailfilteragent/filtermanager.h b/agents/mailfilteragent/filtermanager.h
index 0fc57afb3..107dae60d 100644
--- a/agents/mailfilteragent/filtermanager.h
+++ b/agents/mailfilteragent/filtermanager.h
@@ -64,7 +64,7 @@ public:
     /**
      * Destroys the filter manager.
      */
-    virtual ~FilterManager();
+    ~FilterManager() override;
 
     /**
      * Clears the list of filters and deletes them.
diff --git a/src/configuredialog/configureaccountpage.h b/src/configuredialog/configureaccountpage.h
index bb211c155..4aa14c8bb 100644
--- a/src/configuredialog/configureaccountpage.h
+++ b/src/configuredialog/configureaccountpage.h
@@ -32,7 +32,7 @@ class AccountsPageSendingTab : public ConfigModuleTab
     Q_OBJECT
 public:
     explicit AccountsPageSendingTab(QWidget *parent = nullptr);
-    virtual ~AccountsPageSendingTab();
+    ~AccountsPageSendingTab() override;
     QString helpAnchor() const;
     void save() override;
 
diff --git a/src/kmail_part.h b/src/kmail_part.h
index 480194b31..ce93b4d03 100644
--- a/src/kmail_part.h
+++ b/src/kmail_part.h
@@ -39,7 +39,7 @@ class KMailPart : public KParts::ReadOnlyPart
 
 public:
     KMailPart(QWidget *parentWidget, QObject *parent, const QVariantList &);
-    virtual ~KMailPart();
+    ~KMailPart() override;
 
     QWidget *parentWidget() const;
 
diff --git a/src/kmcommands.h b/src/kmcommands.h
index 6e05ee176..7c9f3371b 100644
--- a/src/kmcommands.h
+++ b/src/kmcommands.h
@@ -62,7 +62,7 @@ public:
     // Retrieve all messages in msgList when start is called.
     KMCommand(QWidget *parent, const Akonadi::Item::List &msgList);
     // Retrieve the single message msgBase when start is called.
-    virtual ~KMCommand();
+    ~KMCommand() override;
 
     /** Returns the result of the command. Only call this method from the slot
       connected to completed().
diff --git a/src/kmmainwidget.h b/src/kmmainwidget.h
index c750e942e..72155c3f6 100644
--- a/src/kmmainwidget.h
+++ b/src/kmmainwidget.h
@@ -96,7 +96,7 @@ public:
     typedef QList<KMMainWidget *> PtrList;
 
     KMMainWidget(QWidget *parent, KXMLGUIClient *aGUIClient, KActionCollection *actionCollection, KSharedConfig::Ptr config = KMKernel::self()->config());
-    virtual ~KMMainWidget();
+    ~KMMainWidget() override;
     void destruct();
 
     /** Read configuration options before widgets are created. */
diff --git a/src/kmmainwin.h b/src/kmmainwin.h
index 4777a11c0..99b838c69 100644
--- a/src/kmmainwin.h
+++ b/src/kmmainwin.h
@@ -38,7 +38,7 @@ public:
     // the main window needs to have a name since else restoring the window
     // settings by kwin doesn't work
     explicit KMMainWin(QWidget *parent = nullptr);
-    virtual ~KMMainWin();
+    ~KMMainWin() override;
     KMMainWidget *mainKMWidget() const;
 
     /// Same as KMMainWin::restore(), except that it also restores the docked state,
diff --git a/src/kmreadermainwin.h b/src/kmreadermainwin.h
index 3a0e43958..6550a0b5a 100644
--- a/src/kmreadermainwin.h
+++ b/src/kmreadermainwin.h
@@ -36,7 +36,7 @@ public:
     KMReaderMainWin(MessageViewer::Viewer::DisplayFormatMessage format, bool htmlLoadExtOverride, const QString &name = QString());
     explicit KMReaderMainWin(const QString &name = QString());
     KMReaderMainWin(KMime::Content *aMsgPart, MessageViewer::Viewer::DisplayFormatMessage format, const QString &encoding, const QString &name = QString());
-    virtual ~KMReaderMainWin();
+    ~KMReaderMainWin() override;
 
     void setUseFixedFont(bool useFixedFont);
 
diff --git a/src/kmreaderwin.h b/src/kmreaderwin.h
index 8c84284c4..d8d31fce2 100644
--- a/src/kmreaderwin.h
+++ b/src/kmreaderwin.h
@@ -54,7 +54,7 @@ class KMAIL_EXPORT KMReaderWin : public QWidget
 
 public:
     explicit KMReaderWin(QWidget *parent, QWidget *mainWindow, KActionCollection *actionCollection);
-    virtual ~KMReaderWin();
+    ~KMReaderWin() override;
 
     /** Read settings from app's config file. */
     void readConfig();
diff --git a/src/settings/kmailsettings.h b/src/settings/kmailsettings.h
index 579291ca3..595314a9d 100644
--- a/src/settings/kmailsettings.h
+++ b/src/settings/kmailsettings.h
@@ -46,7 +46,7 @@ private Q_SLOTS:
 
 private:
     KMailSettings();
-    virtual ~KMailSettings();
+    ~KMailSettings() override;
     static KMailSettings *mSelf;
 
     QTimer *mConfigSyncTimer = nullptr;