diff --git a/include/wx/gtk/choice.h b/include/wx/gtk/choice.h
index 6acce9a5de..2739c20267 100644
--- a/include/wx/gtk/choice.h
+++ b/include/wx/gtk/choice.h
@@ -68,6 +68,7 @@ protected:
 
     virtual wxSize DoGetBestSize() const;
 
+    virtual bool IsOwnGtkWindow( GdkWindow *window );
 private:
     // common part of Create() and DoAppend()
     size_t GtkAppendHelper(GtkWidget *menu, const wxString& item);
diff --git a/include/wx/gtk1/choice.h b/include/wx/gtk1/choice.h
index 6acce9a5de..2739c20267 100644
--- a/include/wx/gtk1/choice.h
+++ b/include/wx/gtk1/choice.h
@@ -68,6 +68,7 @@ protected:
 
     virtual wxSize DoGetBestSize() const;
 
+    virtual bool IsOwnGtkWindow( GdkWindow *window );
 private:
     // common part of Create() and DoAppend()
     size_t GtkAppendHelper(GtkWidget *menu, const wxString& item);