diff --git a/include/manager.h b/include/manager.h
index 08e8cbcb1..99bfea975 100644
--- a/include/manager.h
+++ b/include/manager.h
@@ -203,7 +203,7 @@ class Manager
  protected:
   kiwix::Library* library;
 
-  bool readBookFromPath(const std::string& path, Book* book = NULL);
+  bool readBookFromPath(const std::string& path, Book* book);
   bool parseXmlDom(const pugi::xml_document& doc,
                    const bool readOnly,
                    const std::string& libraryPath);
diff --git a/src/manager.cpp b/src/manager.cpp
index f944f6893..8b646bf37 100644
--- a/src/manager.cpp
+++ b/src/manager.cpp
@@ -55,7 +55,7 @@ bool Manager::parseXmlDom(const pugi::xml_document& doc,
         || atoi(libraryVersion.c_str()) <= atoi(KIWIX_LIBRARY_VERSION)) {
       ok = false;
       if (!book.getPath().empty()) {
-        ok = this->readBookFromPath(book.getPath());
+        ok = this->readBookFromPath(book.getPath(), &book);
       }
     }