diff --git a/include/bn256/bn256.h b/include/bn256/bn256.h
index 2e9e80a..3ffa85a 100644
--- a/include/bn256/bn256.h
+++ b/include/bn256/bn256.h
@@ -23,6 +23,7 @@
 #include <system_error>
 #include <cstring>
 #include <functional>
+#include <cstdint>
 #include <bn256/span.h>
 
 namespace bn256 {