diff -u b/core/includes/common.inc b/core/includes/common.inc
--- b/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -353,8 +353,7 @@
  *   TRUE if the address is in a valid format.
  */
 function valid_email_address($mail) {
-  $validator = new EmailValidator();
-  return $validator->isValid($mail);
+  return (new EmailValidator())->isValid($mail);
 }
 
 /**