diff --git a/core/modules/system/src/Tests/Session/SessionTest.php b/core/modules/system/src/Tests/Session/SessionTest.php
index c4f89c5..f4a0dbc 100644
--- a/core/modules/system/src/Tests/Session/SessionTest.php
+++ b/core/modules/system/src/Tests/Session/SessionTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\system\Tests\Session;
 
 use Drupal\Component\Serialization\Yaml;
+use Drupal\Core\DependencyInjection\YamlFileLoader;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -233,6 +234,7 @@ function testSessionWrite() {
     $data = Yaml::decode(file_get_contents($filename));
     $data['parameters']['session_write_interval'] = 0;
     file_put_contents($filename, Yaml::encode($data));
+    YamlFileLoader::reset();
     $this->rebuildContainer();
 
     $this->drupalGet('');