diff --git a/core/tests/Drupal/Tests/Core/Cache/DatabaseBackendFactoryTest.php b/core/tests/Drupal/Tests/Core/Cache/DatabaseBackendFactoryTest.php
index 9d5ac4bdf9..a720fc70ea 100644
--- a/core/tests/Drupal/Tests/Core/Cache/DatabaseBackendFactoryTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/DatabaseBackendFactoryTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\Core\Cache;
 
+use Drupal\Component\Serialization\PhpSerialize;
 use Drupal\Core\Cache\CacheTagsChecksumInterface;
 use Drupal\Core\Cache\DatabaseBackend;
 use Drupal\Core\Cache\DatabaseBackendFactory;
@@ -24,7 +25,8 @@ public function testGet(array $settings, $expected_max_rows_foo, $expected_max_r
     $database_backend_factory = new DatabaseBackendFactory(
       $this->prophesize(Connection::class)->reveal(),
       $this->prophesize(CacheTagsChecksumInterface::class)->reveal(),
-      new Settings($settings)
+      new Settings($settings),
+      new PhpSerialize()
     );
 
     $this->assertSame($expected_max_rows_foo, $database_backend_factory->get('foo')->getMaxRows());