diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index a9fc745e7e9d..3153d6cb623d 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -115,7 +115,7 @@ public function __construct(ClassMetadataFactoryInterface $classMetadataFactory
             throw new InvalidArgumentException(sprintf('The "%s" given in the default context is not callable.', self::MAX_DEPTH_HANDLER));
         }
 
-        $this->defaultContext[self::EXCLUDE_FROM_CACHE_KEY] = [self::CIRCULAR_REFERENCE_LIMIT_COUNTERS];
+        $this->defaultContext[self::EXCLUDE_FROM_CACHE_KEY] = array_merge($this->defaultContext[self::EXCLUDE_FROM_CACHE_KEY] ?? [], [self::CIRCULAR_REFERENCE_LIMIT_COUNTERS]);
 
         $this->propertyTypeExtractor = $propertyTypeExtractor;
 
@@ -360,7 +360,7 @@ public function denormalize($data, $type, $format = null, array $context = [])
             try {
                 $this->setAttributeValue($object, $attribute, $value, $format, $context);
             } catch (InvalidArgumentException $e) {
-                throw new NotNormalizableValueException(sprintf('Failed to denormalize attribute "%s" value for class "%s": ', $attribute, $type).$e->getMessage(), $e->getCode(), $e);
+                throw new NotNormalizableValueException(sprintf('Failed to denormalize attribute "%s" value for class "%s": '.$e->getMessage(), $attribute, $type), $e->getCode(), $e);
             }
         }
 
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
index 073aaddfe0b5..4c6ef1fadc12 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
@@ -741,6 +741,17 @@ public function testNormalizeNotSerializableContext()
         }]));
     }
 
+    public function testDefaultExcludeFromCacheKey()
+    {
+        $normalizer = new class(null, null, null, null, null, null, [ObjectNormalizer::EXCLUDE_FROM_CACHE_KEY => ['foo']]) extends ObjectNormalizer {
+            protected function isCircularReference($object, &$context)
+            {
+                ObjectNormalizerTest::assertContains('foo', $this->defaultContext[ObjectNormalizer::EXCLUDE_FROM_CACHE_KEY]);
+            }
+        };
+        $normalizer->normalize(new ObjectDummy());
+    }
+
     public function testThrowUnexpectedValueException()
     {
         $this->expectException('Symfony\Component\Serializer\Exception\UnexpectedValueException');