diff --git a/lib/ace/mode/javascript_highlight_rules.js b/lib/ace/mode/javascript_highlight_rules.js
index b16f5969..fd66db1a 100644
--- a/lib/ace/mode/javascript_highlight_rules.js
+++ b/lib/ace/mode/javascript_highlight_rules.js
@@ -67,7 +67,7 @@ JavaScriptHighlightRules = function() {
         "start" : [
 	        {
 	            token : "comment",
-	            regex : "/#.*$/"
+	            regex : "\\/\\/.*$"
 	        },
 	        docComment.getStartRule("doc-start"),
 	        {