diff --git a/block_field.services.yml b/block_field.services.yml
index e953d1f..2b87c49 100755
--- a/block_field.services.yml
+++ b/block_field.services.yml
@@ -2,3 +2,10 @@ services:
   block_field.manager:
     class: Drupal\block_field\BlockFieldManager
     arguments: ['@plugin.manager.block']
+  serializer.normalizer.block_field_item:
+    class: Drupal\block_field\Normalizer\BlockFieldItemNormalizer
+    arguments: ['@hal.link_manager', '@serializer.entity_resolver']
+    # The priority must be higher than that of
+    # serializer.normalizer.field_item.hal in hal.services.yml.
+    tags:
+      - { name: normalizer, priority: 20}
diff --git a/src/BlockFieldServiceProvider.php b/src/BlockFieldServiceProvider.php
deleted file mode 100644
index 61b8da3..0000000
--- a/src/BlockFieldServiceProvider.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-namespace Drupal\block_field;
-
-use Drupal\block_field\Normalizer\BlockFieldItemNormalizer;
-use Drupal\Core\DependencyInjection\ContainerBuilder;
-use Drupal\Core\DependencyInjection\ServiceProviderBase;
-use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
-
-/**
- * Service Provider for block_field module.
- */
-class BlockFieldServiceProvider extends ServiceProviderBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function alter(ContainerBuilder $container) {
-    $modules = $container->getParameter('container.modules');
-    if (isset($modules['hal'])) {
-      // In case Hal module is enabled, add a normalizer for block field items.
-      $service_definition = new Definition(BlockFieldItemNormalizer::class, [
-        new Reference('hal.link_manager'),
-        new Reference('serializer.entity_resolver'),
-      ]);
-      $service_definition->addTag('normalizer', ['priority' => 20]);
-      $container->setDefinition('serializer.normalizer.block_field_item', $service_definition);
-    }
-  }
-
-}
diff --git a/src/Normalizer/BlockFieldItemNormalizer.php b/src/Normalizer/BlockFieldItemNormalizer.php
index 0c5f914..268bb52 100644
--- a/src/Normalizer/BlockFieldItemNormalizer.php
+++ b/src/Normalizer/BlockFieldItemNormalizer.php
@@ -11,9 +11,7 @@ use Drupal\hal\Normalizer\FieldItemNormalizer;
 class BlockFieldItemNormalizer extends FieldItemNormalizer {
 
   /**
-   * The interface or class that this Normalizer supports.
-   *
-   * @var string
+   * {@inheritdoc}
    */
   protected $supportedInterfaceOrClass = BlockFieldItem::class;
 
@@ -21,10 +19,10 @@ class BlockFieldItemNormalizer extends FieldItemNormalizer {
    * {@inheritdoc}
    */
   public function normalize($field_item, $format = NULL, array $context = []) {
-    // Let HAL normalizer do the initial normalization.
+    // Let HAL field item normalizer do the initial normalization.
     $data = parent::normalize($field_item, $format, $context);
 
-    // Normalize settings property.
+    // The block's settings aren't normalized. Add them here.
     $data[$field_item->getParent()->getName()][0]['settings'] = $field_item->settings;
 
     return $data;