diff --git a/core/modules/language/src/Form/NegotiationUrlForm.php b/core/modules/language/src/Form/NegotiationUrlForm.php
index 7ed6bd7..0261f41 100644
--- a/core/modules/language/src/Form/NegotiationUrlForm.php
+++ b/core/modules/language/src/Form/NegotiationUrlForm.php
@@ -111,8 +111,8 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     );
 
     $languages = $this->languageManager->getLanguages();
-    $prefixes = language_negotiation_url_prefixes();
-    $domains = language_negotiation_url_domains();
+    $prefixes = $config->get('url.prefixes');
+    $domains = $config->get('url.domains');
     foreach ($languages as $langcode => $language) {
       $t_args = array('%language' => $language->getName(), '%langcode' => $language->getId());
       $form['prefix'][$langcode] = array(