diff --git a/usr/local/www/system_gateways_edit.php b/usr/local/www/system_gateways_edit.php
index a1a0df52bb..91601c2e26 100755
--- a/usr/local/www/system_gateways_edit.php
+++ b/usr/local/www/system_gateways_edit.php
@@ -117,7 +117,7 @@ if ($_POST) {
 			$parent_ip = get_interface_ip($_POST['interface']);
 			$parent_sn = get_interface_subnet($_POST['interface']);
 			if(empty($parent_ip) || empty($parent_sn)) {
-				$input_errors[] = gettext("You can not use a IPv4 Gateway Address on a IPv6 only interface.");
+				$input_errors[] = gettext("Cannot add IPv4 Gateway Address because no IPv4 address could be found on the interface.");
 			} else {
 				$subnets = array(gen_subnet($parent_ip, $parent_sn) . "/" . $parent_sn);
 				$vips = link_interface_to_vips($_POST['interface']);
@@ -145,7 +145,7 @@ if ($_POST) {
 				$parent_ip = get_interface_ipv6($_POST['interface']);
 				$parent_sn = get_interface_subnetv6($_POST['interface']);
 				if(empty($parent_ip) || empty($parent_sn)) {
-					$input_errors[] = gettext("You can not use a IPv6 Gateway Address on a IPv4 only interface.");
+					$input_errors[] = gettext("Cannot add IPv6 Gateway Address because no IPv6 address could be found on the interface.");
 				} else {
 					$subnets = array(gen_subnetv6($parent_ip, $parent_sn) . "/" . $parent_sn);
 					$vips = link_interface_to_vips($_POST['interface']);