diff --git a/health_metric_config.hpp b/health_metric_config.hpp
index 49f39ad..6391462 100644
--- a/health_metric_config.hpp
+++ b/health_metric_config.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <sdbusplus/message.hpp>
 #include <xyz/openbmc_project/Common/Threshold/server.hpp>
 
 #include <chrono>
@@ -41,6 +42,9 @@
     NA
 };
 
+auto to_string(Type) -> std::string;
+auto to_string(SubType) -> std::string;
+
 namespace config
 {