diff --git a/app/code/Magento/ImportExport/Test/Unit/Model/Export/ConfigTest.php b/app/code/Magento/ImportExport/Test/Unit/Model/Export/ConfigTest.php
index d00642d86e9b9d44db0a3af442a7f0ce349b2815..9e025c4a11e2d8101933f2dc500362bfc5934f19 100644
--- a/app/code/Magento/ImportExport/Test/Unit/Model/Export/ConfigTest.php
+++ b/app/code/Magento/ImportExport/Test/Unit/Model/Export/ConfigTest.php
@@ -18,7 +18,7 @@ class ConfigTest extends \PHPUnit_Framework_TestCase
     protected $cacheMock;
 
     /**
-     * @var \Magento\Framework\Serialize\SerializerInterface
+     * @var \Magento\Framework\Serialize\SerializerInterface|\PHPUnit_Framework_MockObject_MockObject
      */
     private $serializerMock;