diff --git a/src/Validator.php b/src/Validator.php
index <HASH>..<HASH> 100644
--- a/src/Validator.php
+++ b/src/Validator.php
@@ -25,7 +25,7 @@ use stdClass;
 
 class Validator implements IValidator
 {
-    private const BELL = "\x07";
+    const BELL = "\x07";
 
     /** @var IValidatorHelper */
     protected $helper = null;
Removed access modifier to maintain php 7 compatibility