diff --git a/include/wx/qt/dialog.h b/include/wx/qt/dialog.h
index 8bd995d906..288e1b3ed2 100644
--- a/include/wx/qt/dialog.h
+++ b/include/wx/qt/dialog.h
@@ -34,7 +34,7 @@ public:
     virtual int ShowModal() wxOVERRIDE;
     virtual void EndModal(int retCode) wxOVERRIDE;
     virtual bool IsModal() const wxOVERRIDE;
-    virtual bool Show(bool show) wxOVERRIDE;
+    virtual bool Show(bool show = true) wxOVERRIDE;
 
     QDialog *GetDialogHandle() const;