diff --git a/contrib/handypack/handypack.hpp b/contrib/handypack/handypack.hpp
index c65570d..73f72f2 100644
--- a/contrib/handypack/handypack.hpp
+++ b/contrib/handypack/handypack.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <string>
 #include <vector>
 #include <list>