diff --git a/core/modules/config/src/Tests/ConfigLanguageOverrideWebTest.php b/core/modules/config/src/Tests/ConfigLanguageOverrideWebTest.php
index 34f5172..5a3d85c 100644
--- a/core/modules/config/src/Tests/ConfigLanguageOverrideWebTest.php
+++ b/core/modules/config/src/Tests/ConfigLanguageOverrideWebTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config\Tests;
 
+use Drupal\Core\Language\LanguageInterface;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -42,7 +43,7 @@ function testSiteNameTranslation() {
       'predefined_langcode' => 'custom',
       'langcode' => $langcode,
       'name' => $name,
-      'direction' => '0',
+      'direction' => LanguageInterface::DIRECTION_LTR,
     );
     $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
     \Drupal::languageManager()
diff --git a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
index 08e28e3..f9d05b6 100644
--- a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
+++ b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
@@ -577,7 +577,7 @@ public function testLocaleDBStorage() {
       'predefined_langcode' => 'custom',
       'langcode' => $langcode,
       'name' => $name,
-      'direction' => '0',
+      'direction' => Language::DIRECTION_LTR,
     );
     $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));