diff --git a/app/assets/javascripts/discourse/models/group.js.es6 b/app/assets/javascripts/discourse/models/group.js.es6
index 20da61e31fa..42f9575e1f7 100644
--- a/app/assets/javascripts/discourse/models/group.js.es6
+++ b/app/assets/javascripts/discourse/models/group.js.es6
@@ -179,7 +179,7 @@ Group.reopenClass({
 
   loadMembers(name, offset, limit, params) {
     return ajax('/groups/' + name + '/members.json', {
-      data: Object.assign({
+      data: _.extend({
         limit: limit || 50,
         offset: offset || 0
       }, params || {})