diff --git a/docs/demos/promiseify-post-message/index.md b/docs/demos/promiseify-post-message/index.md
index cf9f6116..67d4f133 100644
--- a/docs/demos/promiseify-post-message/index.md
+++ b/docs/demos/promiseify-post-message/index.md
@@ -14,4 +14,6 @@ footer: false
 import DemoComponent from './Index.vue'
 </script>
 
-<DemoComponent />
\ No newline at end of file
+<ClientOnly>
+  <DemoComponent />
+</ClientOnly>
\ No newline at end of file
diff --git a/docs/demos/promiseify-post-message/inner.md b/docs/demos/promiseify-post-message/inner.md
index 95439850..2adc489f 100644
--- a/docs/demos/promiseify-post-message/inner.md
+++ b/docs/demos/promiseify-post-message/inner.md
@@ -11,4 +11,6 @@ outline: false
 import DemoComponent from './Inner.vue'
 </script>
 
-<DemoComponent />
\ No newline at end of file
+<ClientOnly>
+  <DemoComponent />
+</ClientOnly>
\ No newline at end of file