diff --git a/Tests/Fixtures/NotNormalizableDummy.php b/Tests/Fixtures/NotNormalizableDummy.php
index 41da0eac..ef7a8c90 100644
--- a/Tests/Fixtures/NotNormalizableDummy.php
+++ b/Tests/Fixtures/NotNormalizableDummy.php
@@ -26,6 +26,6 @@ public function __construct()
 
     public function denormalize(DenormalizerInterface $denormalizer, $data, ?string $format = null, array $context = []): void
     {
-        throw new NotNormalizableValueException();
+        throw new NotNormalizableValueException('Custom exception message');
     }
 }
diff --git a/Tests/Normalizer/AbstractObjectNormalizerTest.php b/Tests/Normalizer/AbstractObjectNormalizerTest.php
index c8eab2a0..4f5b4a1f 100644
--- a/Tests/Normalizer/AbstractObjectNormalizerTest.php
+++ b/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -888,6 +888,7 @@ public function testDenormalizeUntypedFormat()
     public function testDenormalizeUntypedFormatNotNormalizable()
     {
         $this->expectException(NotNormalizableValueException::class);
+        $this->expectExceptionMessage('Custom exception message');
         $serializer = new Serializer([new CustomNormalizer(), new ObjectNormalizer(null, null, null, new PropertyInfoExtractor([], [new PhpDocExtractor(), new ReflectionExtractor()]))]);
         $serializer->denormalize(['value' => 'test'], DummyWithNotNormalizable::class, 'xml');
     }