diff --git a/lib/internal/Magento/Framework/ObjectManager/Test/Unit/ObjectManagerTest.php b/lib/internal/Magento/Framework/ObjectManager/Test/Unit/ObjectManagerTest.php
index 091b44f74003a..1da3144e7d61c 100644
--- a/lib/internal/Magento/Framework/ObjectManager/Test/Unit/ObjectManagerTest.php
+++ b/lib/internal/Magento/Framework/ObjectManager/Test/Unit/ObjectManagerTest.php
@@ -400,7 +400,7 @@ public function testGetIgnoresFirstSlash()
     {
         $this->assertSame(
             $this->_object->get(\Magento\Test\Di\Child::class),
-            $this->_object->get(\Magento\Test\Di\Child::class)
+            $this->_object->get('\\' . \Magento\Test\Di\Child::class)
         );
     }
 }