diff --git a/core/lib/Drupal/Core/Routing/CachedUrlGenerator.php b/core/lib/Drupal/Core/Routing/CachedUrlGenerator.php
index d73b769..1cdd9ca 100644
--- a/core/lib/Drupal/Core/Routing/CachedUrlGenerator.php
+++ b/core/lib/Drupal/Core/Routing/CachedUrlGenerator.php
@@ -151,7 +151,7 @@ public function setRequest(Request $request) {
     $this->cacheKey = $request->attributes->get('_system_path');
     // Only multilingual sites have language dependant URLs.
     if ($this->languageManager->isMultilingual()) {
-      $this->cacheKey .= '::' . $this->languageManager->getLanguage(Language::TYPE_URL)->getId();
+      $this->cacheKey .= '::' . $this->languageManager->getLanguage(Language::TYPE_URL)->id;
     }
     $cached = $this->cache->get($this->cacheKey);
     if ($cached) {