diff --git a/lib/ace/mode/javascript_highlight_rules.js b/lib/ace/mode/javascript_highlight_rules.js
index 7b315fcf..61903b05 100644
--- a/lib/ace/mode/javascript_highlight_rules.js
+++ b/lib/ace/mode/javascript_highlight_rules.js
@@ -116,7 +116,7 @@ var JavaScriptHighlightRules = function() {
                 regex : "(?:true|false)\\b"
             }, {
                 token : "keyword",
-                regex : kwBeforeRe,
+                regex : "(?:" + kwBeforeRe + ")\\b",
                 next : "regex_allowed"
             }, {
                 token : function(value) {