diff --git a/packages/components/message-box/src/index.vue b/packages/components/message-box/src/index.vue
index ea3bb8b4f7..22fde4fd42 100644
--- a/packages/components/message-box/src/index.vue
+++ b/packages/components/message-box/src/index.vue
@@ -479,7 +479,7 @@ export default defineComponent({
 
     // locks the screen to prevent scroll
     if (props.lockScroll) {
-      useLockscreen(visible)
+      useLockscreen(visible, { ns })
     }
 
     return {