diff --git a/include/blowfish.h b/include/blowfish.h
index 6e5d195..168eaf4 100644
--- a/include/blowfish.h
+++ b/include/blowfish.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <QByteArray>
+#include <tuple>
 
 constexpr int Rounds = 16;