diff --git a/core/modules/layout_builder/src/Normalizer/LayoutEntityDisplayNormalizer.php b/core/modules/layout_builder/src/Normalizer/LayoutEntityDisplayNormalizer.php
index ab6ae6acc0..09e80b430d 100644
--- a/core/modules/layout_builder/src/Normalizer/LayoutEntityDisplayNormalizer.php
+++ b/core/modules/layout_builder/src/Normalizer/LayoutEntityDisplayNormalizer.php
@@ -22,7 +22,7 @@ class LayoutEntityDisplayNormalizer extends ConfigEntityNormalizer {
   /**
    * {@inheritdoc}
    */
-  public function normalize($object, $format = NULL, array $context = []) {
+  public function normalize($object, $format = NULL, array $context = []): array|string|int|float|bool|\ArrayObject|NULL {
     $data = parent::normalize($object, $format, $context);
     if (!empty($data['third_party_settings']['layout_builder']['sections'])) {
       $sections = &$data['third_party_settings']['layout_builder']['sections'];
diff --git a/core/modules/layout_builder/src/Normalizer/SectionDataNormalizer.php b/core/modules/layout_builder/src/Normalizer/SectionDataNormalizer.php
index aff09048ec..bf4a63255a 100644
--- a/core/modules/layout_builder/src/Normalizer/SectionDataNormalizer.php
+++ b/core/modules/layout_builder/src/Normalizer/SectionDataNormalizer.php
@@ -20,7 +20,7 @@ class SectionDataNormalizer extends TypedDataNormalizer implements DenormalizerI
   /**
    * {@inheritdoc}
    */
-  public function normalize($object, $format = NULL, array $context = []) {
+  public function normalize($object, $format = NULL, array $context = []): array|string|int|float|bool|\ArrayObject|NULL {
     $value = parent::normalize($object, $format, $context);
     return $value->toArray();
   }