diff --git a/include/class_userinfo.inc b/include/class_userinfo.inc
index 507e936b8b2e9a7a44986814f4ed4bd68298291d..305ecae99ccd32f0be9f6b067ef5685317f747a6 100644
--- a/include/class_userinfo.inc
+++ b/include/class_userinfo.inc
@@ -48,6 +48,7 @@ class userinfo
   var $language     = "";
   var $groups       = [];
   var $roles        = [];
+  var $mail         = '';
 
   /*! \brief LDAP attributes of this user at login */
   protected $cachedAttrs  = [];