diff --git a/xkit.js b/xkit.js
index bfe4af403..9131a1924 100755
--- a/xkit.js
+++ b/xkit.js
@@ -820,7 +820,7 @@ var xkit_global_start = Date.now();  // log start timestamp
 					$("#xkit_notification_" + m_notification_id).slideDown('slow');
 				}, 100);
 				$("#xkit_notification_" + m_notification_id).click(function() {
-					if (typeof callback !== undefined) {
+					if (typeof callback !== "undefined") {
 						try {
 							callback();
 						} catch (e) {