diff --git a/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/CSVListField.php b/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/CSVListField.php
index 69a90200f..037d147b1 100644
--- a/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/CSVListField.php
+++ b/src/opnsense/mvc/app/models/OPNsense/Base/FieldTypes/CSVListField.php
@@ -42,11 +42,6 @@ class CSVListField extends BaseField
      */
     protected $internalIsContainer = false;
 
-    /**
-     * @var string default validation message string
-     */
-    protected $internalValidationMessage = "list validation error";
-
     /**
      * item separator
      * @var string
@@ -69,6 +64,15 @@ class CSVListField extends BaseField
      */
     protected $internalMaskPerItem = false;
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function defaultValidationMessage()
+    {
+        return gettext('List validation error.');
+
+    }
+
     /**
      * set validation mask
      * @param string $value regexp validation mask
@@ -162,12 +166,12 @@ class CSVListField extends BaseField
                     $items = explode($this->separatorchar, $this->internalValue);
                     foreach ($items as $item) {
                         if (!$regex_match($item, $this->internalMask)) {
-                            return ["\"" . $item . "\" is invalid. " . $this->internalValidationMessage];
+                            return ["\"" . $item . "\" is invalid. " . $this->getValidationMessage()];
                         }
                     }
                 } else {
                     if (!$regex_match($this->internalValue, $this->internalMask)) {
-                        return [$this->internalValidationMessage];
+                        return [$this->getValidationMessage()];
                     }
                 }
                 return [];