diff --git a/components/carousel/demo/vertical.md b/components/carousel/demo/vertical.md
index 6829fa87fd..548d8c77b7 100644
--- a/components/carousel/demo/vertical.md
+++ b/components/carousel/demo/vertical.md
@@ -17,7 +17,7 @@ Vertical pagination.
 import { Carousel } from 'antd';
 
 ReactDOM.render(
-  <Carousel vertical="true">
+  <Carousel vertical>
     <div><h3>1</h3></div>
     <div><h3>2</h3></div>
     <div><h3>3</h3></div>