--- include/orcus/base64.hpp
+++ include/orcus/base64.hpp
@@ -9,6 +9,7 @@
 #define __ORCUS_BASE64_HPP__
 
 #include "env.hpp"
+#include <stdint.h>
 #include <vector>
 #include <string>
 
--- include/orcus/types.hpp
+++ include/orcus/types.hpp
@@ -16,6 +16,7 @@
 #pragma GCC diagnostic ignored "-Wshadow"
 #endif
 
+#include <stdint.h>
 #include <cstdlib>
 #include <vector>
 #include <string>