diff --git a/bookstore/src/main/java/com/hexagonal/service/BookService.java b/bookstore/src/main/java/com/hexagonal/service/BookService.java
deleted file mode 100644
index cb5e1a930e..0000000000
--- a/bookstore/src/main/java/com/hexagonal/service/BookService.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.hexagonal.service;
-
-import java.util.List;
-
-import com.hexagonal.domain.Book;
-
-public interface BookService {
-
-    public void addBook(Book book);
-
-    public Book buyBook(String isbn);
-
-    public List<Book> listBooks();
-
-}