diff --git a/tests/Doctrine/Tests/ORM/Performance/ProxyPerformanceTest.php b/tests/Doctrine/Tests/ORM/Performance/ProxyPerformanceTest.php
index b94fd812e..f06e273ab 100644
--- a/tests/Doctrine/Tests/ORM/Performance/ProxyPerformanceTest.php
+++ b/tests/Doctrine/Tests/ORM/Performance/ProxyPerformanceTest.php
@@ -113,6 +113,12 @@ class MockEntityManager extends EntityManager
         );
     }
 
+    /** {@inheritDoc} */
+    public function getMetadataFactory()
+    {
+        return $this->em->getMetadataFactory();
+    }
+
     /** {@inheritDoc} */
     public function getClassMetadata($className)
     {