core/modules/serialization/src/Normalizer/NormalizerBase.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/modules/serialization/src/Normalizer/NormalizerBase.php b/core/modules/serialization/src/Normalizer/NormalizerBase.php
index 987e96062f..e0b6796484 100644
--- a/core/modules/serialization/src/Normalizer/NormalizerBase.php
+++ b/core/modules/serialization/src/Normalizer/NormalizerBase.php
@@ -13,6 +13,8 @@
 use Drupal\hal\Normalizer\FieldNormalizer as HalFieldNormalizer;
 use Drupal\hal\Normalizer\FieldItemNormalizer as HalFieldItemNormalizer;
 use Drupal\hal\Normalizer\TimestampItemNormalizer as HalTimestampItemNormalizer;
+use Drupal\jsonapi\Normalizer\FieldNormalizer as JsonApiFieldNormalizer;
+use Drupal\jsonapi\Normalizer\FieldItemNormalizer as JsonApiFieldItemNormalizer;
 
 /**
  * Base class for Normalizers.
@@ -125,6 +127,9 @@ protected static function disallowFieldLevelNormalizers(array $supported, $norma
       FieldItemNormalizer::class,
       HalFieldNormalizer::class,
       HalFieldItemNormalizer::class,
+      // Generic field normalizers for the JSON:API normalization.
+      JsonApiFieldNormalizer::class,
+      JsonApiFieldItemNormalizer::class,
       // The NULL normalizer allows one to prevent listed classes from ever
       // being normalized. By default, this is applied only to the 'password'
       // field type.