diff --git a/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php b/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php
index 5c046712e..16ef9a9fa 100644
--- a/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php
+++ b/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php
@@ -278,7 +278,7 @@ class FilterRule
         if (!empty($rule['reply-to'])) {
             // reply-to gateway set, when found map to reply attribute, otherwise skip keyword
             if (!empty($this->gatewayMapping[$rule['reply-to']])) {
-                $if = $this->gatewayMapping[$rule['reply-to']]['if'];
+                $if = $this->gatewayMapping[$rule['reply-to']]['interface'];
                 $gw = $this->gatewayMapping[$rule['reply-to']]['gateway'];
                 $rule['reply'] = "reply-to ( {$if} {$gw} ) ";
             }