diff --git a/data/web/oauth/profile.php b/data/web/oauth/profile.php
index 2e2e41a2..fb33adfb 100644
--- a/data/web/oauth/profile.php
+++ b/data/web/oauth/profile.php
@@ -14,6 +14,7 @@ if (!empty($mailbox)) {
     echo json_encode(array(
       'success' => true,
       'username' => $token['user_id'],
+      'identifier' => $token['user_id'],
       'email' => (!empty($mailbox['username']) ? $mailbox['username'] : ''),
       'full_name' => (!empty($mailbox['name']) ? $mailbox['name'] : 'mailcow administrative user'),
       'created' => (!empty($mailbox['created']) ? $mailbox['created'] : ''),