diff --git a/boot/boot.js b/boot/boot.js
index e5128c225..3a2d3d765 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -271,14 +271,15 @@ $tw.utils.stringifyList = function(value) {
 $tw.utils.parseStringArray = function(value) {
 	if(typeof value === "string") {
 		var memberRegExp = /(?:^|[^\S\xA0])(?:\[\[(.*?)\]\])(?=[^\S\xA0]|$)|([\S\xA0]+)/mg,
-			results = [],
+			results = [], names = {},
 			match;
 		do {
 			match = memberRegExp.exec(value);
 			if(match) {
 				var item = match[1] || match[2];
-				if(item !== undefined && results.indexOf(item) === -1) {
+				if(item !== undefined && !$tw.utils.hop(names,item)) {
 					results.push(item);
+					names[item] = true;
 				}
 			}
 		} while(match);