diff --git a/src/main/java/org/ntlab/citrusserver/entities/Book.java b/src/main/java/org/ntlab/citrusserver/entities/Book.java
index 76c3dd9..e6fc9a4 100644
--- a/src/main/java/org/ntlab/citrusserver/entities/Book.java
+++ b/src/main/java/org/ntlab/citrusserver/entities/Book.java
@@ -9,9 +9,9 @@
     private String accountId;
 
 
-    public Book(String accountId, Integer bookid, String title, boolean publicity, String color) {
+    public Book(String accountId, Integer bookId, String title, boolean publicity, String color) {
         this.accountId = accountId;
-        this.bookId = bookid;
+        this.bookId = bookId;
 
         this.title = title;
         this.publicity = publicity;