diff --git a/message_subscribe_email/message_subscribe_email.module b/message_subscribe_email/message_subscribe_email.module
index 9c4cf5d..a4337dc 100644
--- a/message_subscribe_email/message_subscribe_email.module
+++ b/message_subscribe_email/message_subscribe_email.module
@@ -129,6 +129,7 @@ function message_subscribe_email_message_subscribe_get_subscribers_alter(&$uids,
   $result = $query->fields('f', array('uid'))
     ->condition('fid', $flag_ids, 'IN')
     ->condition('uid', array_keys($uids), 'IN')
+    ->condition('content_type', 'user')
     ->groupBy('uid')
     ->execute()
     ->fetchAll();