diff --git a/src/private/MDILayoutWidget_p.h b/src/private/MDILayoutWidget_p.h
index 61b8f109..267befbe 100644
--- a/src/private/MDILayoutWidget_p.h
+++ b/src/private/MDILayoutWidget_p.h
@@ -36,7 +36,7 @@ public:
     ~MDILayoutWidget() override;
 
     /// @brief docks the dock widgets into this MDI area, at the specified position
-    void addDockWidget(DockWidgetBase *dw, QPoint localPt, InitialOption addingOption);
+    void addDockWidget(DockWidgetBase *dw, QPoint localPt, InitialOption addingOption = {});
 
     /// @brief Moves a dock widget @p dw to point @p pos
     void moveDockWidget(DockWidgetBase *dw, QPoint pos);