diff --git a/src/overlay.jsx b/src/overlay.jsx
index 92df3e69a9a48a..0ad2b12d3a2f9e 100644
--- a/src/overlay.jsx
+++ b/src/overlay.jsx
@@ -54,7 +54,7 @@ const Overlay = React.createClass({
     };
   },
 
-  componentWillMount() {
+  componentDidMount() {
     this._originalBodyOverflow = document.getElementsByTagName('body')[0].style.overflow;
   },