diff --git a/src/book.h b/src/book.h
index 33f72fb51..b68f7bfca 100644
--- a/src/book.h
+++ b/src/book.h
@@ -53,7 +53,10 @@ struct BookEntry {
 };
 
 class Book : private std::ifstream {
+  Book(const Book&); // just decleared..
+  Book& operator=(const Book&); // ..to avoid a warning
 public:
+  Book() {}
   ~Book();
   void open(const std::string& fName);
   void close();