diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 4688c192a0..1ce69472c2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -89,7 +89,6 @@ use Symfony\Component\Serializer\Encoder\EncoderInterface;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorFromClassMetadata;
 use Symfony\Component\Serializer\Mapping\Factory\CacheClassMetadataFactory;
 use Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer;
-use Symfony\Component\Serializer\Normalizer\DateIntervalNormalizer;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Stopwatch\Stopwatch;
@@ -1312,10 +1311,6 @@ class FrameworkExtension extends Extension
     {
         $loader->load('serializer.xml');
 
-        if (!class_exists(DateIntervalNormalizer::class)) {
-            $container->removeDefinition('serializer.normalizer.dateinterval');
-        }
-
         if (!class_exists(ConstraintViolationListNormalizer::class)) {
             $container->removeDefinition('serializer.normalizer.constraint_violation_list');
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
index 0b27dbff63..81f687c63f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
@@ -1102,10 +1102,6 @@ abstract class FrameworkExtensionTest extends TestCase
 
     public function testDateIntervalNormalizerRegistered()
     {
-        if (!class_exists(DateIntervalNormalizer::class)) {
-            $this->markTestSkipped('The DateIntervalNormalizer has been introduced in the Serializer Component version 3.4.');
-        }
-
         $container = $this->createContainerFromFile('full');
 
         $definition = $container->getDefinition('serializer.normalizer.dateinterval');