diff --git a/src/debugger/gui/DebuggerDialog.hxx b/src/debugger/gui/DebuggerDialog.hxx
index 3199a7e23..b313bd0e3 100644
--- a/src/debugger/gui/DebuggerDialog.hxx
+++ b/src/debugger/gui/DebuggerDialog.hxx
@@ -74,7 +74,7 @@ class DebuggerDialog : public Dialog
     void showFatalMessage(const string& msg);
 
   private:
-    void center() { positionAt(0); }
+    void center() override { positionAt(0); }
     void loadConfig() override;
     void handleKeyDown(StellaKey key, StellaMod mod) override;
     void handleCommand(CommandSender* sender, int cmd, int data, int id) override;
diff --git a/src/gui/LauncherDialog.hxx b/src/gui/LauncherDialog.hxx
index 70b89d0a2..fb5e6358f 100644
--- a/src/gui/LauncherDialog.hxx
+++ b/src/gui/LauncherDialog.hxx
@@ -85,11 +85,11 @@ class LauncherDialog : public Dialog
     void reload() { updateListing(); }
 
   private:
-    void center() { positionAt(0); }
+    void center() override { positionAt(0); }
     void handleKeyDown(StellaKey key, StellaMod mod) override;
     void handleMouseDown(int x, int y, MouseButton b, int clickCount) override;
     void handleCommand(CommandSender* sender, int cmd, int data, int id) override;
-    void handleJoyDown(int stick, int button);
+    void handleJoyDown(int stick, int button) override;
     Event::Type getJoyAxisEvent(int stick, int axis, int value) override;
 
     void loadConfig() override;