diff --git a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
index a9c9fd1..c5bbf15 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
@@ -21,7 +21,7 @@
     {
         Account account = new Account(); //仮（Account作成時に相談）
         Book book = new Book(title, publicity, color);
-        int newBookId = account.getNewBookId(accountId); //仮（本の数を更新し、AccountIDを返してもらう）
+        int newBookId = account.getNewBookId(); //仮（本の数を更新し、AccountIDを返してもらう）
         booksMap.get(accountId).put(newBookId, book); //ブックに追加
         return newBookId;
     }