diff --git a/src/www/firewall_nat.php b/src/www/firewall_nat.php
index 029736576..637a79abe 100644
--- a/src/www/firewall_nat.php
+++ b/src/www/firewall_nat.php
@@ -122,36 +122,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             if (!isset($id)) {
                 $id = count($a_nat);
             }
-            $a_nat_new = array();
-
-            /* copy all rules < $id and not selected */
-            for ($i = 0; $i < $id; $i++) {
-                if (!in_array($i, $pconfig['rule'])) {
-                    $a_nat_new[] = $a_nat[$i];
-                }
-            }
-
-            /* copy all selected rules */
-            for ($i = 0; $i < count($a_nat); $i++) {
-                if ($i == $id)
-                    continue;
-                if (in_array($i, $pconfig['rule'])) {
-                    $a_nat_new[] = $a_nat[$i];
-                }
-            }
-
-            /* copy $id rule */
-            if ($id < count($a_nat)) {
-                $a_nat_new[] = $a_nat[$id];
-            }
-
-            /* copy all rules > $id and not selected */
-            for ($i = $id+1; $i < count($a_nat); $i++) {
-                if (!in_array($i, $pconfig['rule'])) {
-                    $a_nat_new[] = $a_nat[$i];
-                }
-            }
-            $a_nat = $a_nat_new;
+            $a_nat = legacy_move_config_list_items($a_nat, $id,  $pconfig['rule']);
         }
         if (write_config()) {
             mark_subsystem_dirty('natconf');