diff --git a/packages/core/useMouseInElement/demo.vue b/packages/core/useMouseInElement/demo.vue
index 7db0accbc9c5..b605aae5cd88 100644
--- a/packages/core/useMouseInElement/demo.vue
+++ b/packages/core/useMouseInElement/demo.vue
@@ -11,5 +11,5 @@ const text = stringify(mouse)
 
 <template>
   <CompA ref="target" />
-  <pre ref="demo" lang="yaml">{{ text }}</pre>
+  <pre lang="yaml">{{ text }}</pre>
 </template>