diff --git a/src/wl_window.c b/src/wl_window.c
index a3d9601b..300dc571 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -277,6 +277,8 @@ static void xdgDecorationHandleConfigure(void* userData,
 
     if (mode == ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE)
         createFallbackDecorations(window);
+    else
+        destroyFallbackDecorations(window);
 }
 
 static const struct zxdg_toplevel_decoration_v1_listener xdgDecorationListener =