diff --git a/components/affix/index.jsx b/components/affix/index.jsx
index 02b60d4cf3..dd9698c8cb 100644
--- a/components/affix/index.jsx
+++ b/components/affix/index.jsx
@@ -85,7 +85,7 @@ var Affix = React.createClass({
   },
 
   render() {
-    var affix = this.state.affix ? 'affix' : '';
+    var affix = this.state.affix ? 'ant-affix' : '';
     var className = this.props.className;
 
     return (