diff -rupN a/source3/auth/server_info.c b/source3/auth/server_info.c
--- a/source3/auth/server_info.c        2012-04-27 20:25:33.000000000 +0200
+++ b/source3/auth/server_info.c        2012-05-09 09:23:27.000000000 +0200
@@ -273,11 +273,6 @@ static NTSTATUS group_sids_to_info3(stru
        for (i = 0; i < num_sids; i++) {
                ok = sid_peek_check_rid(domain_sid, &sids[i], &rid);
                if (ok) {
-
-                       /* if it is the primary gid, skip it, we
-                        * obviously already have it */
-                       if (info3->base.primary_gid == rid) continue;
-
                        /* store domain group rid */
                        groups->rids[groups->count].rid = rid;
                        groups->rids[groups->count].attributes = attributes;