diff --git a/app/code/Magento/Tax/Block/Sales/Order/Tax.php b/app/code/Magento/Tax/Block/Sales/Order/Tax.php
index 94e5b972db121..2ea0bcddea14e 100644
--- a/app/code/Magento/Tax/Block/Sales/Order/Tax.php
+++ b/app/code/Magento/Tax/Block/Sales/Order/Tax.php
@@ -260,11 +260,11 @@ protected function _initShipping()
     }
 
     /**
-     * @return null
+     * @return void
      */
     protected function _initDiscount()
     {
-        return null;
+        return;
     }
 
     /**