diff --git a/rhodecode/templates/admin/auth/plugin_settings.mako b/rhodecode/templates/admin/auth/plugin_settings.mako
--- a/rhodecode/templates/admin/auth/plugin_settings.mako
+++ b/rhodecode/templates/admin/auth/plugin_settings.mako
@@ -112,6 +112,7 @@
     $("#tls_reqcert").select2(select2Options);
     $("#search_scope").select2(select2Options);
     $("#group_extraction_type").select2(select2Options);
+    $("#admin_groups_sync").select2(select2Options);
 });
 </script>
 </%def>