diff --git a/dlls/x11drv/winpos.c b/dlls/x11drv/winpos.c
index f7c80a4a6c5..dddc554f498 100644
--- a/dlls/x11drv/winpos.c
+++ b/dlls/x11drv/winpos.c
@@ -1256,6 +1256,7 @@ int X11DRV_SetWindowRgn( HWND hwnd, HRGN hrgn, BOOL redraw )
     }
 #endif  /* HAVE_LIBXSHAPE */
 
+    invalidate_dce( hwnd, &data->window_rect );
     return TRUE;
 }