diff --git a/src/widgets/dialogs/qdialog.h b/src/widgets/dialogs/qdialog.h
index 7d3052a782..f20ff46d41 100644
--- a/src/widgets/dialogs/qdialog.h
+++ b/src/widgets/dialogs/qdialog.h
@@ -91,8 +91,8 @@ Q_SIGNALS:
     void rejected();
 
 public Q_SLOTS:
-    void open();
-    int exec();
+    virtual void open();
+    virtual int exec();
     virtual void done(int);
     virtual void accept();
     virtual void reject();