diff --git a/extensions/openpower-pels/user_data_json.hpp b/extensions/openpower-pels/user_data_json.hpp
index 9d6b79d..930e378 100644
--- a/extensions/openpower-pels/user_data_json.hpp
+++ b/extensions/openpower-pels/user_data_json.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <optional>
 #include <string>
 #include <vector>