diff --git a/vrf/type.h b/vrf/type.h
index 13d46c4..a667602 100644
--- a/vrf/type.h
+++ b/vrf/type.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <cstddef>
+#include <cstdint>
 #include <ostream>
 #include <string_view>
 #include <utility>