diff --git a/modules/default/calendar/calendar.js b/modules/default/calendar/calendar.js
index 1db1a594..5b81431b 100755
--- a/modules/default/calendar/calendar.js
+++ b/modules/default/calendar/calendar.js
@@ -122,7 +122,7 @@ Module.register("calendar", {
 
 	// Override socket notification handler.
 	socketNotificationReceived: function (notification, payload) {
-		if (this.identifier != payload.id)
+		if (this.identifier !== payload.id)
 		{return;}
 
 		if (notification === "CALENDAR_EVENTS") {