diff --git a/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/BaseListField.php b/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/BaseListField.php
index 70372d90e..f211e9562 100644
--- a/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/BaseListField.php
+++ b/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/BaseListField.php
@@ -55,7 +55,7 @@ abstract class BaseListField extends BaseField
     /**
      * @var bool field may contain multiple interfaces at once
      */
-    private $internalMultiSelect = false;
+    protected $internalMultiSelect = false;
 
     /**
      * @var string default validation message string