diff --git a/gtk/gtkmenu.c b/gtk/gtkmenu.c
index ec74a5a006..5b84eab3fa 100644
--- a/gtk/gtkmenu.c
+++ b/gtk/gtkmenu.c
@@ -1985,6 +1985,7 @@ gtk_menu_popup_internal (GtkMenu             *menu,
     gtk_menu_shell_select_first (menu_shell, TRUE);
 
   /* Once everything is set up correctly, map the toplevel */
+  gtk_window_force_resize (GTK_WINDOW (priv->toplevel));
   gtk_widget_show (priv->toplevel);
 
   if (xgrab_shell == widget)
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 4806504a78..699a70286c 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -264,6 +264,7 @@ struct _GtkWindowPrivate
   guint    tiled                     : 1;
   guint    unlimited_guessed_size_x  : 1;
   guint    unlimited_guessed_size_y  : 1;
+  guint    force_resize              : 1;
 
   guint    use_subsurface            : 1;
 
@@ -6468,6 +6469,14 @@ gtk_window_set_unlimited_guessed_size (GtkWindow *window,
   priv->unlimited_guessed_size_y = y;
 }
 
+void
+gtk_window_force_resize (GtkWindow *window)
+{
+  GtkWindowPrivate *priv = window->priv;
+
+  priv->force_resize = TRUE;
+}
+
 /* (Note: Replace "size" with "width" or "height". Also, the request
  * mode is honoured.)
  * For selecting the default window size, the following conditions
@@ -9384,7 +9393,8 @@ gtk_window_compute_configure_request_size (GtkWindow   *window,
   
   info = gtk_window_get_geometry_info (window, FALSE);
 
-  if (priv->need_default_size)
+  if (priv->need_default_size ||
+      priv->force_resize)
     {
       gtk_window_guess_default_size (window, width, height);
       gtk_window_get_remembered_size (window, &w, &h);
@@ -9789,9 +9799,13 @@ gtk_window_move_resize (GtkWindow *window)
       info->last.configure_request.y != new_request.y)
     configure_request_pos_changed = TRUE;
 
-  if ((info->last.configure_request.width != new_request.width ||
+  if (priv->force_resize ||
+      (info->last.configure_request.width != new_request.width ||
        info->last.configure_request.height != new_request.height))
-    configure_request_size_changed = TRUE;
+    {
+      priv->force_resize = FALSE;
+      configure_request_size_changed = TRUE;
+    }
   
   hints_changed = FALSE;
   
diff --git a/gtk/gtkwindowprivate.h b/gtk/gtkwindowprivate.h
index 0f4c631b77..9c12233c95 100644
--- a/gtk/gtkwindowprivate.h
+++ b/gtk/gtkwindowprivate.h
@@ -138,6 +138,7 @@ GdkScreen *_gtk_window_get_screen (GtkWindow *window);
 void       gtk_window_set_unlimited_guessed_size (GtkWindow *window,
                                                   gboolean   x,
                                                   gboolean   y);
+void       gtk_window_force_resize (GtkWindow *window);
 
 /* Exported handles */