diff --git a/src/PhpSpreadsheet/Worksheet/Protection.php b/src/PhpSpreadsheet/Worksheet/Protection.php
index 81abc0b7..ba3af0a7 100644
--- a/src/PhpSpreadsheet/Worksheet/Protection.php
+++ b/src/PhpSpreadsheet/Worksheet/Protection.php
@@ -143,13 +143,6 @@ class Protection
      */
     private $algorithm = '';
 
-    /**
-     * Hash value.
-     *
-     * @var string
-     */
-    private $hash = '';
-
     /**
      * Salt value.
      *