diff --git a/src/ng/directive/input.js b/src/ng/directive/input.js
index 94fabb6a1026..13944c38fd67 100644
--- a/src/ng/directive/input.js
+++ b/src/ng/directive/input.js
@@ -1322,7 +1322,7 @@ var ngListDirective = function() {
       ctrl.$parsers.push(parse);
       ctrl.$formatters.push(function(value) {
         if (isArray(value)) {
-          return value.join(', ');
+          return value.join(separator);
         }
 
         return undefined;