diff --git a/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberForeignTest.php b/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberForeignTest.php
index 9daf6f1..a53c3cf 100644
--- a/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberForeignTest.php
+++ b/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberForeignTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\locale\Kernel;
 
+use Drupal\Core\DependencyInjection\ContainerBuilder;
 use Drupal\Core\Language\Language;
 use Drupal\language\Entity\ConfigurableLanguage;
 
@@ -15,11 +16,13 @@ class LocaleConfigSubscriberForeignTest extends LocaleConfigSubscriberTest {
   /**
    * {@inheritdoc}
    */
-  protected function defaultLanguageData() {
-    $data = Language::$defaultValues;
-    $data['id'] = 'hu';
-    $data['name'] = 'Hungarian';
-    return $data;
+  public function register(ContainerBuilder $container) {
+    parent::register($container);
+
+    $language = Language::$defaultValues;
+    $language['id'] = 'hu';
+    $language['name'] = 'Hungarian';
+    $container->setParameter('language.default_values', $language);
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/KernelTestBase.php b/core/tests/Drupal/KernelTests/KernelTestBase.php
index 0ff0ab4..fe6a877 100644
--- a/core/tests/Drupal/KernelTests/KernelTestBase.php
+++ b/core/tests/Drupal/KernelTests/KernelTestBase.php
@@ -606,7 +606,7 @@ public function register(ContainerBuilder $container) {
       ->setAlias('keyvalue', 'keyvalue.memory');
 
     // Set the default language on the minimal container.
-    $container->setParameter('language.default_values', $this->defaultLanguageData());
+    $container->setParameter('language.default_values', Language::$defaultValues);
 
     if ($this->strictConfigSchema) {
       $container
@@ -634,16 +634,6 @@ public function register(ContainerBuilder $container) {
   }
 
   /**
-   * Provides the data for setting the default language on the container.
-   *
-   * @return array
-   *   The data array for the default language.
-   */
-  protected function defaultLanguageData() {
-    return Language::$defaultValues;
-  }
-
-  /**
    * Gets the config schema exclusions for this test.
    *
    * @return string[]