diff --git a/src/opnsense/mvc/app/models/OPNsense/Firewall/Filter.php b/src/opnsense/mvc/app/models/OPNsense/Firewall/Filter.php
index bdd86f2a7..788975f9b 100644
--- a/src/opnsense/mvc/app/models/OPNsense/Firewall/Filter.php
+++ b/src/opnsense/mvc/app/models/OPNsense/Firewall/Filter.php
@@ -108,9 +108,11 @@ class Filter extends BaseModel
                         }
                     }
 
-                    if (!empty((string)$rule->interfacenot) && (
+                    if (
+                        !empty((string)$rule->interfacenot) && (
                         count(explode(',', $rule->interface)) != 1 || empty((string)$rule->interface)
-                    )) {
+                        )
+                    ) {
                         $messages->appendMessage(new Message(
                             gettext("Inverting interfaces is only allowed for single targets to avoid mis-interpretations"),
                             $rule->interfacenot->__reference