diff --git a/apps/external/ajax/setsites.php b/apps/external/ajax/setsites.php
index 772863974ae..188e71e891c 100644
--- a/apps/external/ajax/setsites.php
+++ b/apps/external/ajax/setsites.php
@@ -8,6 +8,7 @@
 
  
 OCP\User::checkAdminUser();
+OCP\JSON::callCheck();
 
 $sites = array();
 for ($i = 0; $i < sizeof($_POST['site_name']); $i++) {