diff --git a/tbsetup/setgroups.in b/tbsetup/setgroups.in
index f2797d52c3ef6014cdeff8752c9416b1a8b56708..d32c8e49116c0171e04f13ca09954f07c574a991 100755
--- a/tbsetup/setgroups.in
+++ b/tbsetup/setgroups.in
@@ -261,7 +261,12 @@ foreach my $uid (@userlist) {
 		     " and m.trust!='none'");
 
     while (@db_row = $query_result->fetchrow_array() ) {
-	push(@groupnames, $db_row[0]);
+	    my $groupname = $db_row[0];
+
+	    next
+		if ($ELABINELAB && !getgrnam($groupname));
+
+	    push(@groupnames, $groupname);
     }
 
     if (0) {