diff --git a/core/bookmarkmanager.h b/core/bookmarkmanager.h
index 85d5fcd13..fc07b3a3b 100644
--- a/core/bookmarkmanager.h
+++ b/core/bookmarkmanager.h
@@ -13,6 +13,7 @@
 #include <kbookmark.h>
 
 #include "okularcore_export.h"
+#include <QObject>
 #include <QUrl>
 
 class QAction;
diff --git a/generators/comicbook/directory.h b/generators/comicbook/directory.h
index bef0adbe5..01dd473de 100644
--- a/generators/comicbook/directory.h
+++ b/generators/comicbook/directory.h
@@ -13,6 +13,8 @@
 
 #include <QtCore/QStringList>
 
+class QIODevice;
+
 class Directory
 {
     public: