diff --git a/include/ipmid/sessiondef.hpp b/include/ipmid/sessiondef.hpp
index ac63f8f..0311c91 100644
--- a/include/ipmid/sessiondef.hpp
+++ b/include/ipmid/sessiondef.hpp
@@ -16,6 +16,9 @@
  */
 #pragma once
 
+#include <stddef.h>
+#include <stdint.h>
+
 namespace session
 {