diff --git a/src/opnsense/mvc/app/library/OPNsense/Firewall/NptRule.php b/src/opnsense/mvc/app/library/OPNsense/Firewall/NptRule.php
index d77c18528..63fc1afe6 100644
--- a/src/opnsense/mvc/app/library/OPNsense/Firewall/NptRule.php
+++ b/src/opnsense/mvc/app/library/OPNsense/Firewall/NptRule.php
@@ -74,7 +74,7 @@ class NptRule extends Rule
         foreach ($this->reader('npt') as $rule) {
             if (empty($rule['to'])) {
                 /* auto-detect expands from dynamic interface address */
-                $rule['to'] = "({$rule['interface']}:0)/" . explode('/', $rule['from'])[1];
+                $rule['to'] = parseInterface($rule['interface'], '(', ':0)/' . explode('/', $rule['from'])[1]);
             }
             yield $rule;
         }