diff --git a/en/development/testing.rst b/en/development/testing.rst
index 8631555d03..f1af49c6f8 100644
--- a/en/development/testing.rst
+++ b/en/development/testing.rst
@@ -412,7 +412,7 @@ contains the fixture extension:
     <!-- in phpunit.xml -->
     <!-- Setup the extension for fixtures -->
     <extensions>
-        <extension class="\Cake\TestSuite\Fixture\PHPUnitExtension"/>
+        <bootstrap class="Cake\TestSuite\Fixture\Extension\PHPUnitExtension"/>
     </extensions>
 
 The extension is included in your application and plugins generated by ``bake``