diff --git a/include/libeosio/hash.hpp b/include/libeosio/hash.hpp
index 8fc9b02..6503b29 100644
--- a/include/libeosio/hash.hpp
+++ b/include/libeosio/hash.hpp
@@ -24,7 +24,7 @@
 #ifndef LIBEOSIO_HASH_H
 #define LIBEOSIO_HASH_H
 
-#include <cstdint>
+#include <cstddef>
 
 namespace libeosio {