diff --git a/src/Normalizer/DataNormalizer.php b/src/Normalizer/DataNormalizer.php
deleted file mode 100644
index 690a5bc..0000000
--- a/src/Normalizer/DataNormalizer.php
+++ /dev/null
@@ -1,34 +0,0 @@
-<?php
-
-namespace Drupal\jsonapi\Normalizer;
-
-use Drupal\Core\Cache\CacheableMetadata;
-use Drupal\jsonapi\JsonApiResource\Data;
-use Drupal\jsonapi\Normalizer\Value\CacheableNormalization;
-
-/**
- * Normalizes JSON:API Data objects.
- *
- * @internal
- */
-class DataNormalizer extends NormalizerBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  protected $supportedInterfaceOrClass = Data::class;
-
-  /**
-   * {@inheritdoc}
-   */
-  public function normalize($object, $format = NULL, array $context = []) {
-    assert($object instanceof Data);
-    $cacheable_normalizations = array_map(function ($resource) use ($format, $context) {
-      return $this->serializer->normalize($resource, $format, $context);
-    }, $object->toArray());
-    return $object->getCardinality() === 1
-      ? array_shift($cacheable_normalizations) ?: new CacheableNormalization(new CacheableMetadata(), NULL)
-      : CacheableNormalization::aggregate($cacheable_normalizations);
-  }
-
-}