diff --git a/src/index.js b/src/index.js
index 63cf8f1b..22efed83 100644
--- a/src/index.js
+++ b/src/index.js
@@ -316,7 +316,7 @@ module.exports = React.createClass({
     }
 
     this.setState({
-      index: index,
+      index: Math.round(index),
       offset: offset,
     })
   },