--- a/src/gui_w16.c
+++ b/src/gui_w16.c
@@ -764,6 +764,22 @@ clear_rect(RECT *rcp)
 }
 
 
+    void
+gui_mch_get_screen_dimensions(int *screen_w, int *screen_h)
+{
+
+    *screen_w = GetSystemMetrics(SM_CXFULLSCREEN)
+	      - GetSystemMetrics(SM_CXFRAME) * 2;
+    /* FIXME: dirty trick: Because the gui_get_base_height() doesn't include
+     * the menubar for MSwin, we subtract it from the screen height, so that
+     * the window size can be made to fit on the screen. */
+    *screen_h = GetSystemMetrics(SM_CYFULLSCREEN)
+	      - GetSystemMetrics(SM_CYFRAME) * 2
+#ifdef FEAT_MENU
+	      - gui_mswin_get_menu_height(FALSE)
+#endif
+	      ;
+}
 
 
 #if defined(FEAT_MENU) || defined(PROTO)