diff --git a/app/common/tohex.h b/app/common/tohex.h
index 0e7eff7dd..600baf54d 100644
--- a/app/common/tohex.h
+++ b/app/common/tohex.h
@@ -1,6 +1,7 @@
 #ifndef TOHEX_H
 #define TOHEX_H
 
+#include <QString>
 #include <QtGlobal>
 
 #include "common/define.h"