diff --git a/include/wx/gtk/popupwin.h b/include/wx/gtk/popupwin.h
index 97c9db64fb..4ae6a307b6 100644
--- a/include/wx/gtk/popupwin.h
+++ b/include/wx/gtk/popupwin.h
@@ -42,9 +42,6 @@ protected:
 
     virtual void DoMoveWindow(int x, int y, int width, int height);
 
-private:
-    virtual void AddChildGTK(wxWindowGTK* child);
-
 #ifdef __WXUNIVERSAL__
     DECLARE_EVENT_TABLE()
 #endif
diff --git a/src/gtk/popupwin.cpp b/src/gtk/popupwin.cpp
index 32e440006b..17d0671e93 100644
--- a/src/gtk/popupwin.cpp
+++ b/src/gtk/popupwin.cpp
@@ -73,14 +73,6 @@ bool gtk_dialog_delete_callback( GtkWidget *WXUNUSED(widget), GdkEvent *WXUNUSED
 }
 }
 
-void wxPopupWindow::AddChildGTK(wxWindowGTK* child)
-{
-    gtk_widget_set_size_request(
-        child->m_widget, child->m_width, child->m_height);
-    gtk_fixed_put(
-        GTK_FIXED(m_wxwindow), child->m_widget, child->m_x, child->m_y);
-}
-
 //-----------------------------------------------------------------------------
 // wxPopupWindow
 //-----------------------------------------------------------------------------