diff --git a/examples/master-detail/app.js b/examples/master-detail/app.js
index 653f76f0e7..32c5a6558d 100644
--- a/examples/master-detail/app.js
+++ b/examples/master-detail/app.js
@@ -94,7 +94,7 @@ var App = React.createClass({
     ContactStore.removeChangeListener(this.updateContacts);
   },
 
-  updateContacts: function (contacts) {
+  updateContacts: function () {
     if (!this.isMounted())
       return;