diff --git a/src/Unserialize/TSantosSample.php b/src/Unserialize/TSantosSample.php
index 300aeb5..a61b1e4 100644
--- a/src/Unserialize/TSantosSample.php
+++ b/src/Unserialize/TSantosSample.php
@@ -59,6 +59,7 @@ public function __construct()
             ->setMetadataDriver(new YamlDriver($fileLocator, new TypeGuesser()))
             ->setSerializerClassDir(__DIR__ . '/../../cache/tsantos/classes')
             ->setMetadataCacheDir(__DIR__ . '/../../cache/tsantos/metadata')
+            ->enableBuiltInNormalizers()
             ->setDebug(false);
 
         if (false === $strategy = getenv('SERIALIZER_ACCESSOR_STRATEGY')) {