diff --git a/source/Ox.UI/js/Form/Ox.OptionGroup.js b/source/Ox.UI/js/Form/Ox.OptionGroup.js
index e36bab1b..7366e439 100644
--- a/source/Ox.UI/js/Form/Ox.OptionGroup.js
+++ b/source/Ox.UI/js/Form/Ox.OptionGroup.js
@@ -111,7 +111,7 @@ Ox.OptionGroup = function(items, min, max, property) {
     this.value = function() {
         var value = items.filter(function(item) {
             return item[property];
-        }).function(item) {
+        }).map(function(item) {
             return item.id;
         });
         return max == 1 ? (value.length ? value[0] : '') : value;