diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index 931e203..6744ae6 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -421,7 +421,7 @@ function language_save(LanguageInterface $language) {
   $language_entity->direction = $language->getDirection();
   $language_entity->locked = $language->isLocked();
   $language_entity->weight = $language->getWeight();
-  $language_entity->setDefault($language->isDefault());
+  $language_entity->language()->setDefault($language->isDefault());
   $language_entity->save();
   $t_args = array('%language' => $language->getName(), '%langcode' => $language->getId());
   if ($language_entity->isNew()) {