diff --git a/core/modules/simpletest/src/InstallerTestBase.php b/core/modules/simpletest/src/InstallerTestBase.php
index 7207555..e6f7d7b 100644
--- a/core/modules/simpletest/src/InstallerTestBase.php
+++ b/core/modules/simpletest/src/InstallerTestBase.php
@@ -112,11 +112,8 @@ protected function setUp() {
       ->register('language.default', 'Drupal\Core\Language\LanguageDefault')
       ->addArgument('%language.default_values%');
     $this->container
-      ->register('language_manager', 'Drupal\Core\Language\LanguageManager')
-      ->addArgument(new Reference('language.default'));
-    $this->container
       ->register('string_translation', 'Drupal\Core\StringTranslation\TranslationManager')
-      ->addArgument(new Reference('language_manager'));
+      ->addArgument(new Reference('language.default'));
     $this->container
       ->set('app.root', DRUPAL_ROOT);
     \Drupal::setContainer($this->container);