diff --git a/core/modules/book/src/Tests/BookTest.php b/core/modules/book/src/Tests/BookTest.php
index 48c1fec..531889b 100644
--- a/core/modules/book/src/Tests/BookTest.php
+++ b/core/modules/book/src/Tests/BookTest.php
@@ -655,7 +655,7 @@ public function testAdminBookListing() {
    */
   public function testAdminBookNodeListing() {
     // Create a new book.
-    $this->createBook();
+    $nodes = $this->createBook();
     $this->drupalLogin($this->adminUser);
 
     // Load the book page list and assert the created book title is displayed