diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 90e9a78ed..7ff36cd8d 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -801,7 +801,7 @@ MessageTray.prototype = {
 
     _onSummaryItemClicked: function(summaryItem) {
         if (!this._clickedSummaryItem || this._clickedSummaryItem != summaryItem)
-            this._clickedSummaryItem = summaryItem
+            this._clickedSummaryItem = summaryItem;
         else
             this._clickedSummaryItem = null;