diff --git a/core/lib/Drupal/Core/Datetime/Date.php b/core/lib/Drupal/Core/Datetime/Date.php
index b71d8ba..bc4ed7e 100644
--- a/core/lib/Drupal/Core/Datetime/Date.php
+++ b/core/lib/Drupal/Core/Datetime/Date.php
@@ -117,7 +117,7 @@ public function format($timestamp, $type = 'medium', $format = '', $timezone = N
 
     // Fall back to medium if a format was not found.
     if (empty($format)) {
-      $format = $this->dateFormat('fallback', $langcode)->getPattern($key, $langcode);
+      $format = $this->dateFormat('fallback', $langcode)->getPattern($key);
     }
 
     // Call $date->format().