diff --git a/lib/components/Modal.js b/lib/components/Modal.js
index 428b91a1..61e6de59 100644
--- a/lib/components/Modal.js
+++ b/lib/components/Modal.js
@@ -53,7 +53,7 @@ var Modal = React.createClass({
       ariaHideApp: true,
       closeTimeoutMS: 0,
       shouldCloseOnOverlayClick: true,
-      parentSelector: () => document.body
+      parentSelector: function () { return document.body; }
     };
   },