diff --git a/core/modules/language/src/Entity/ConfigurableLanguage.php b/core/modules/language/src/Entity/ConfigurableLanguage.php
index 1f7d980989..91a6424bac 100644
--- a/core/modules/language/src/Entity/ConfigurableLanguage.php
+++ b/core/modules/language/src/Entity/ConfigurableLanguage.php
@@ -184,8 +184,8 @@ public static function postDelete(EntityStorageInterface $storage, array $entiti
 
     // Remove language from language prefix and domain list.
     $config = \Drupal::configFactory()->getEditable('language.negotiation');
-    $config->clear('url.prefixes.' $entity->id());
-    $config->clear('url.domains.' $entity->id());
+    $config->clear('url.prefixes.'$entity->id());
+    $config->clear('url.domains.'$entity->id());
 
     // Save the modified settings.
     $config->set('url.prefixes', $prefixes)