diff --git a/serializer/custom_normalizer.rst b/serializer/custom_normalizer.rst
index a85f70e4eac..9f2e50fdcf1 100644
--- a/serializer/custom_normalizer.rst
+++ b/serializer/custom_normalizer.rst
@@ -21,10 +21,10 @@ to customize the normalized data. To do that, leverage the ``ObjectNormalizer``:
 
     use App\Entity\Topic;
     use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
-    use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+    use Symfony\Component\Serializer\Normalizer\ContextAwareNormalizerInterface;
     use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 
-    class TopicNormalizer implements NormalizerInterface
+    class TopicNormalizer implements ContextAwareNormalizerInterface
     {
         private $router;
         private $normalizer;