diff --git a/CRM/Core/Form.php b/CRM/Core/Form.php
index 0f07bdd1496c..5478f87252a0 100644
--- a/CRM/Core/Form.php
+++ b/CRM/Core/Form.php
@@ -347,6 +347,7 @@ public function registerRules() {
       'settingPath',
       'autocomplete',
       'validContact',
+      'email',
     ];
 
     foreach ($rules as $rule) {