diff --git a/include/libpy/util.h b/include/libpy/util.h
index 3e0c72d..8669483 100644
--- a/include/libpy/util.h
+++ b/include/libpy/util.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <algorithm>
 #include <sstream>
 #include <stdexcept>