diff --git a/lib/ace/mode/text_highlight_rules.js b/lib/ace/mode/text_highlight_rules.js
index ba8c8f4b..654858b7 100644
--- a/lib/ace/mode/text_highlight_rules.js
+++ b/lib/ace/mode/text_highlight_rules.js
@@ -37,6 +37,8 @@
 
 define(function(require, exports, module) {
 
+var lang = require("pilot/lang");
+
 var TextHighlightRules = function() {
 
     // regexp must not have capturing parentheses
@@ -53,19 +55,6 @@ var TextHighlightRules = function() {
     };
 };
 
-// Could probably do with improving and moving into lang.
-var deepCopy = function (o) {
-    var clone = o.constructor();
-    for (var k in o) {
-        if (typeof o[k] === "object") {
-            clone[k] = deepCopy(o[k]);
-        } else {
-            clone[k] = o[k];
-        }
-    }
-    return clone;
-};
-
 (function() {
 
     this.addRules = function(rules, prefix) {
@@ -103,7 +92,7 @@ var deepCopy = function (o) {
         this.addRules(embedRules, prefix);
         
         for (var i = 0; i < states.length; i++) {
-            Array.prototype.unshift.apply(this.$rules[states[i]], deepCopy(escapeRules));
+            Array.prototype.unshift.apply(this.$rules[states[i]], lang.deepCopy(escapeRules));
         }
         
         if (!this.$embeds) {