diff --git a/core/lib/Drupal/Core/Language/LanguageManager.php b/core/lib/Drupal/Core/Language/LanguageManager.php
index 4be6fbf..e87e212 100644
--- a/core/lib/Drupal/Core/Language/LanguageManager.php
+++ b/core/lib/Drupal/Core/Language/LanguageManager.php
@@ -394,7 +394,7 @@ protected function languageFilter(array $languages, $flags = LanguageInterface::
     }
 
     foreach ($languages as $id => $language) {
-      if (($language->locked && ($flags & LanguageInterface::STATE_LOCKED)) || (!$language->locked && ($flags & LanguageInterface::STATE_CONFIGURABLE))) {
+      if (($language->isLocked() && ($flags & LanguageInterface::STATE_LOCKED)) || (!$language->isLocked() && ($flags & LanguageInterface::STATE_CONFIGURABLE))) {
         $filtered_languages[$id] = $language;
       }
     }