diff --git a/source3/auth/auth_util.c b/source3/auth/auth_util.c
index a904da4..1dd0d45 100644
--- a/source3/auth/auth_util.c
+++ b/source3/auth/auth_util.c
@@ -505,6 +505,10 @@ NTSTATUS create_local_token(struct auth_serversupplied_info *server_info)
 				   sid_string_dbg(&t->sids[i])));
 			continue;
 		}
+		if (ids[i].id.gid == (uint32_t)(-1)) {
+			DEBUG(3, ("Artifical GID -1 for SID %s.\n", sid_string_dbg(&t->sids[i])));
+			continue;
+		}
 		if (!add_gid_to_array_unique(server_info, ids[i].id.gid,
 					     &server_info->utok.groups,
 					     &server_info->utok.ngroups)) {