--- a/add_zone_slave.php	Sun May 18 07:56:11 2008 +0000
+++ b/add_zone_slave.php	Sun May 18 11:51:59 2008 +0000
@@ -34,7 +34,7 @@
 (verify_permission('zone_slave_add')) ? $zone_slave_add = "1" : $zone_slave_add = "0" ;
 
 if ($_POST['submit'] && $zone_slave_add == "1") {
-	if (!is_valid_domain($zone)) {
+	if (!is_valid_hostname_fqdn($zone)) {
 		error(ERR_DNS_HOSTNAME);
 	} elseif (domain_exists($zone)) {
 		error(ERR_DOMAIN_EXISTS);