diff --git a/js/client.js b/js/client.js
index 3a6a39ba2..dbc3113da 100644
--- a/js/client.js
+++ b/js/client.js
@@ -998,7 +998,7 @@
 		 *********************************************************/
 
 		initializeRooms: function() {
-			this.rooms = {};
+			this.rooms = Object.create(null); // {}
 
 			$(window).on('resize', _.bind(this.resize, this));
 		},