diff --git a/core/modules/config_translation/src/ConfigNamesMapper.php b/core/modules/config_translation/src/ConfigNamesMapper.php
index 68c0623..a406537 100644
--- a/core/modules/config_translation/src/ConfigNamesMapper.php
+++ b/core/modules/config_translation/src/ConfigNamesMapper.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Language\Language;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Plugin\PluginBase;
+use Drupal\Core\Routing\RouteMatch;
 use Drupal\Core\Routing\RouteProviderInterface;
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
@@ -366,12 +367,8 @@ public function getWeight() {
    * {@inheritdoc}
    */
   public function populateFromRequest(Request $request) {
-    if ($request->attributes->has('langcode')) {
-      $this->langcode = $request->attributes->get('langcode');
-    }
-    else {
-      $this->langcode = NULL;
-    }
+    $route_match = RouteMatch::createFromRequest($request);
+    $this->langcode = $route_match->getParameter('langcode');
   }
 
   /**