diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 224654df..e39b5d80 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -39,6 +39,7 @@
         // Disabled because multiple lines allow code clarity.
         'single_line_throw' => false,
         'global_namespace_import' => ['import_classes' => true, 'import_constants' => true, 'import_functions' => true],
+        'nullable_type_declaration_for_default_null_value' => ['use_nullable_type_declaration' => true]
     ])
     ->setFinder($finder);
 
diff --git a/src/Api/Monetization/Normalizer/EntityNormalizer.php b/src/Api/Monetization/Normalizer/EntityNormalizer.php
index f3124a9b..d90bc7ed 100644
--- a/src/Api/Monetization/Normalizer/EntityNormalizer.php
+++ b/src/Api/Monetization/Normalizer/EntityNormalizer.php
@@ -20,6 +20,7 @@
 
 use Apigee\Edge\Api\Monetization\Structure\NestedObjectReferenceInterface;
 use Apigee\Edge\Normalizer\ObjectNormalizer;
+use ReflectionObject;
 use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
 use Symfony\Component\PropertyInfo\PropertyTypeExtractorInterface;
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
@@ -60,6 +61,7 @@ public function __construct(?ClassMetadataFactoryInterface $classMetadataFactory
      * {@inheritdoc}
      *
      * @psalm-suppress InvalidReturnType stdClass is also an object.
+     * @psalm-suppress InvalidPropertyFetch.
      */
     public function normalize($object, $format = null, array $context = [])
     {
@@ -123,7 +125,7 @@ public function normalize($object, $format = null, array $context = [])
     protected function getNestedObjectProperties($object): array
     {
         $entityReferenceProperties = [];
-        $ro = new \ReflectionObject($object);
+        $ro = new ReflectionObject($object);
         foreach ($ro->getProperties() as $property) {
             $property->setAccessible(true);
             $value = $property->getValue($object);