diff --git a/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue b/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue
index 860a24bac..9ad5a3237 100644
--- a/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue
+++ b/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue
@@ -62,7 +62,7 @@ function onUpdate(val: boolean) {
 }
 
 onMounted(() => {
-  extensionInstalled.value = window.$syncer !== `undefined`
+  extensionInstalled.value = window.$syncer !== undefined
 })
 </script>