diff --git a/fault-monitor/fru-fault-monitor.hpp b/fault-monitor/fru-fault-monitor.hpp
index 54eb655..d8ec721 100644
--- a/fault-monitor/fru-fault-monitor.hpp
+++ b/fault-monitor/fru-fault-monitor.hpp
@@ -4,6 +4,7 @@
 
 #include <sdbusplus/bus.hpp>
 #include <sdbusplus/server.hpp>
+#include <string>
 
 namespace phosphor
 {