diff --git a/install/sql/ispconfig3.sql b/install/sql/ispconfig3.sql
index bf68e5d7cbf70410b9263f7ea7657059d1df4319..e1bfa900ddfd82c08051ca676899b6f10ad9cde5 100644
--- a/install/sql/ispconfig3.sql
+++ b/install/sql/ispconfig3.sql
@@ -897,8 +897,8 @@ CREATE TABLE `mail_user` (
   `login` varchar(255) NOT NULL default '',
   `password` varchar(255) NOT NULL default '',
   `name` varchar(255) NOT NULL default '',
-  `uid` int(11) unsigned NOT NULL default '5000',
-  `gid` int(11) unsigned NOT NULL default '5000',
+  `uid` int(11) NOT NULL default '5000',
+  `gid` int(11) NOT NULL default '5000',
   `maildir` varchar(255) NOT NULL default '',
   `quota` bigint(20) NOT NULL default '-1',
   `cc` varchar(255) NOT NULL default '',