diff --git a/tests/Knp/Menu/Tests/Renderer/TwigRendererTest.php b/tests/Knp/Menu/Tests/Renderer/TwigRendererTest.php
index bf479002..8ebae56d 100644
--- a/tests/Knp/Menu/Tests/Renderer/TwigRendererTest.php
+++ b/tests/Knp/Menu/Tests/Renderer/TwigRendererTest.php
@@ -7,6 +7,8 @@
 use Knp\Menu\MenuItem;
 use Knp\Menu\Renderer\RendererInterface;
 use Knp\Menu\Renderer\TwigRenderer;
+use Knp\Menu\Twig\Helper;
+use Knp\Menu\Twig\MenuExtension;
 use Twig\Environment;
 use Twig\Loader\FilesystemLoader;
 
@@ -16,6 +18,7 @@ public function createRenderer(MatcherInterface $matcher): RendererInterface
     {
         $loader = new FilesystemLoader(__DIR__.'/../../../../../src/Knp/Menu/Resources/views');
         $environment = new Environment($loader);
+        $environment->addExtension(new MenuExtension($this->createMock(Helper::class)));
 
         return new TwigRenderer($environment, 'knp_menu.html.twig', $matcher, ['compressed' => true]);
     }