diff --git a/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/PortField.php b/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/PortField.php
index 84735815c..981dedf0d 100644
--- a/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/PortField.php
+++ b/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/PortField.php
@@ -149,8 +149,10 @@ class PortField extends BaseField
     {
         $validators = parent::getValidators();
         if ($this->internalValidationMessage == null) {
-            $msg = "please specify a valid port number (1-65535) or name (" . implode(",", self::$wellknownservices) .
-                ")";
+            $msg = "please specify a valid port number (1-65535)";
+            if ($this->enableWellKown) {
+                $msg .= " or name (" . implode(",", self::$wellknownservices) . ")";
+            }
         } else {
             $msg = $this->internalValidationMessage;
         }