diff --git a/usr/local/www/firewall_virtual_ip_edit.php b/usr/local/www/firewall_virtual_ip_edit.php
index d6d82b81b9..2aca9bee9a 100755
--- a/usr/local/www/firewall_virtual_ip_edit.php
+++ b/usr/local/www/firewall_virtual_ip_edit.php
@@ -137,8 +137,8 @@ if ($_POST) {
 		$subnet_ip = return_first_two_octets($_POST['subnet']);
 		$iflist = get_configured_interface_list_by_realif(false, true);
 		foreach($iflist as $realif => $if) {
-			$ww_subnet_ip = get_interface_ip($realif);
-			$ww_subnet_bits = get_interface_subnet($realif);
+			$ww_subnet_ip = get_interface_ip($if);
+			$ww_subnet_bits = get_interface_subnet($if);
 			if (ip_in_subnet($_POST['subnet'], gen_subnet($ww_subnet_ip, $ww_subnet_bits) . "/" . $ww_subnet_bits))
 				$found = true;
 		}