diff --git a/skins/base/views/molecules/MessageComposer.js b/skins/base/views/molecules/MessageComposer.js
index 54da22e50f..1fc648627a 100644
--- a/skins/base/views/molecules/MessageComposer.js
+++ b/skins/base/views/molecules/MessageComposer.js
@@ -26,7 +26,7 @@ module.exports = React.createClass({
     displayName: 'MessageComposer',
     mixins: [MessageComposerController],
 
-    onUploadClick(ev) {
+    onUploadClick: function(ev) {
         this.refs.uploadInput.getDOMNode().click();
     },