.../serialization/src/Normalizer/NormalizerBase.php       | 15 ++++++++++-----
 .../tests/src/Kernel/NoFieldTypeNormalizersTest.php       |  2 +-
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/core/modules/serialization/src/Normalizer/NormalizerBase.php b/core/modules/serialization/src/Normalizer/NormalizerBase.php
index 12e79b0..3f4e482 100644
--- a/core/modules/serialization/src/Normalizer/NormalizerBase.php
+++ b/core/modules/serialization/src/Normalizer/NormalizerBase.php
@@ -5,6 +5,11 @@
 use Drupal\Core\Cache\CacheableDependencyInterface;
 use Drupal\Core\Field\FieldItemInterface;
 use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\field_normalization_test\Normalization\TextItemSillyNormalizer;
+use Drupal\hal\Normalizer\FieldNormalizer as HalFieldNormalizer;
+use Drupal\hal\Normalizer\FieldItemNormalizer as HalFieldItemNormalizer;
+use Drupal\hal\Normalizer\EntityReferenceItemNormalizer as HalEntityReferenceItemNormalizer;
+use Drupal\hal\Normalizer\TimestampItemNormalizer as HalTimestampItemNormalizer;
 use Drupal\rest\EventSubscriber\ResourceResponseSubscriber;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\SerializerAwareNormalizer;
@@ -116,20 +121,20 @@ protected static function disallowFieldLevelNormalizers(array $supported, $norma
       // Generic field normalizers for both (default and 'hal') normalizations.
       FieldNormalizer::class,
       FieldItemNormalizer::class,
-      \Drupal\hal\Normalizer\FieldNormalizer::class,
-      \Drupal\hal\Normalizer\FieldItemNormalizer::class,
+      HalFieldNormalizer::class,
+      HalFieldItemNormalizer::class,
       // Entity reference field normalizers for both normalizations.
       EntityReferenceFieldItemNormalizer::class,
-      \Drupal\hal\Normalizer\EntityReferenceItemNormalizer::class,
+      HalEntityReferenceItemNormalizer::class,
       // The NULL normalizer allows one to prevent listed classes from ever
       // being normalized. By default, this is applied only  tothe 'password'
       // field type.
       NullNormalizer::class,
       // TextItemSillyNormalizer is a test-only normalizer.
-      \Drupal\field_normalization_test\Normalization\TextItemSillyNormalizer::class,
+      TextItemSillyNormalizer::class,
       // TimestampItemNormalizer is being deprecated in https://www.drupal.org/project/drupal/issues/2926508.
       TimestampItemNormalizer::class,
-      \Drupal\hal\Normalizer\TimestampItemNormalizer::class,
+      HalTimestampItemNormalizer::class,
     ];
 
     $is_disallowed = function ($name) {
diff --git a/core/modules/serialization/tests/src/Kernel/NoFieldTypeNormalizersTest.php b/core/modules/serialization/tests/src/Kernel/NoFieldTypeNormalizersTest.php
index 8358837..e65a841 100644
--- a/core/modules/serialization/tests/src/Kernel/NoFieldTypeNormalizersTest.php
+++ b/core/modules/serialization/tests/src/Kernel/NoFieldTypeNormalizersTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Tests\serialization\Functional\EntityResource;
+namespace Drupal\Tests\serialization\Kernel;
 
 use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\KernelTests\KernelTestBase;