diff --git a/include/QtCrypto/qca_core.h b/include/QtCrypto/qca_core.h
index 8c25a701dd49961c87bd4a5ebf5024d8459c604b..9592cb3739da1847a7dfc3e14b74bf90c89d53e1 100644
--- a/include/QtCrypto/qca_core.h
+++ b/include/QtCrypto/qca_core.h
@@ -39,6 +39,7 @@
 #include <QList>
 #include <QSharedData>
 #include <QSharedDataPointer>
+#include <QIODevice>
 #include "qca_export.h"
 #include "qca_support.h"
 #include "qca_tools.h"