diff --git a/src/components/views/avatars/BaseAvatar.js b/src/components/views/avatars/BaseAvatar.js
index 5735a99125..6fb86c9cd8 100644
--- a/src/components/views/avatars/BaseAvatar.js
+++ b/src/components/views/avatars/BaseAvatar.js
@@ -1,5 +1,6 @@
 /*
 Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2018 New Vector Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -82,7 +83,7 @@ module.exports = React.createClass({
         }
     },
 
-    onClientSync(syncState, prevState) {
+    onClientSync: function(syncState, prevState) {
         if (this.unmounted) return;
 
         // Consider the client reconnected if there is no error with syncing.