diff --git a/app/code/Magento/Sales/Model/ResourceModel/Order/Item.php b/app/code/Magento/Sales/Model/ResourceModel/Order/Item.php
index bad43713889d7..4a0393b745abc 100644
--- a/app/code/Magento/Sales/Model/ResourceModel/Order/Item.php
+++ b/app/code/Magento/Sales/Model/ResourceModel/Order/Item.php
@@ -6,11 +6,12 @@
 namespace Magento\Sales\Model\ResourceModel\Order;
 
 use Magento\Sales\Model\ResourceModel\EntityAbstract as SalesResource;
+use Magento\Sales\Model\Spi\OrderItemResourceInterface;
 
 /**
  * Flat sales order item resource
  */
-class Item extends SalesResource
+class Item extends SalesResource implements OrderItemResourceInterface
 {
     /**
      * Event prefix