diff --git a/app/assets/javascripts/admin/controllers/admin-user-index.js.es6 b/app/assets/javascripts/admin/controllers/admin-user-index.js.es6
index 2906a4cf8..cf6719ac8 100644
--- a/app/assets/javascripts/admin/controllers/admin-user-index.js.es6
+++ b/app/assets/javascripts/admin/controllers/admin-user-index.js.es6
@@ -65,7 +65,7 @@ export default Ember.Controller.extend(CanCheckEmails, {
     savePrimaryGroup() {
       const self = this;
 
-      return Discourse.ajax("/admin/users/" + this.get('id') + "/primary_group", {
+      return Discourse.ajax("/admin/users/" + this.get('model.id') + "/primary_group", {
         type: 'PUT',
         data: {primary_group_id: this.get('model.primary_group_id')}
       }).then(function () {