diff --git a/src/event_manager.hpp b/src/event_manager.hpp
index a4ccf18..c114000 100644
--- a/src/event_manager.hpp
+++ b/src/event_manager.hpp
@@ -6,6 +6,7 @@
 #include <memory>
 #include <queue>
 #include <sdbusplus/bus.hpp>
+#include <string>
 
 namespace phosphor
 {