diff --git a/core/modules/book/lib/Drupal/book/BookManager.php b/core/modules/book/lib/Drupal/book/BookManager.php
index f10630b..2ec8dec 100644
--- a/core/modules/book/lib/Drupal/book/BookManager.php
+++ b/core/modules/book/lib/Drupal/book/BookManager.php
@@ -376,7 +376,7 @@ public function createMenuName($id) {
    * @param array $book_link
    *   A fully loaded menu link that is part of the book hierarchy.
    */
-  public function updateID(array $book_link) {
+  public function updateID($book_link) {
     $query = $this->connection->select('menu_links');
     $query->addField('menu_links', 'mlid');
     for ($i = 1; $i <= MENU_MAX_DEPTH && $book_link["p$i"]; $i++) {