diff --git a/form/unit_testing.rst b/form/unit_testing.rst
index dca8f7d643c..32cb9b472bf 100644
--- a/form/unit_testing.rst
+++ b/form/unit_testing.rst
@@ -127,7 +127,7 @@ make sure the ``FormRegistry`` uses the created instance::
         protected function setUp()
         {
             // mock any dependencies
-            $this->entityManager = $this->getMock('Doctrine\Common\Persistence\ObjectManager');
+            $this->entityManager = $this->getMockBuilder('Doctrine\Common\Persistence\ObjectManager')->getMock();
 
             parent::setUp();
         }