diff --git a/lib/components/Modal.js b/lib/components/Modal.js
index 4efeee1b..36252c1e 100644
--- a/lib/components/Modal.js
+++ b/lib/components/Modal.js
@@ -94,7 +94,8 @@ var Modal = React.createClass({
         this.portal.closeWithTimeout();
       }
 
-      setTimeout(function() { this.removePortal(); }, closesAt - now);
+      var that = this;
+      setTimeout(function() { that.removePortal(); }, closesAt - now);
     } else {
       this.removePortal();
     }