diff --git a/core/lib/Drupal/Component/Utility/PlaceholderTrait.php b/core/lib/Drupal/Component/Utility/PlaceholderTrait.php
index f5bcb39..2d4c51e 100644
--- a/core/lib/Drupal/Component/Utility/PlaceholderTrait.php
+++ b/core/lib/Drupal/Component/Utility/PlaceholderTrait.php
@@ -84,7 +84,6 @@ protected static function placeholderFormat($string, array $args, &$safe = TRUE)
           break;
 
         case '%':
-        default:
           // Escaped and placeholder.
           if (!SafeMarkup::isSafe($value)) {
             $value = Html::escape($value);