diff --git a/src/event_entry.hpp b/src/event_entry.hpp
index 899e5ec..28a6338 100644
--- a/src/event_entry.hpp
+++ b/src/event_entry.hpp
@@ -5,6 +5,7 @@
 
 #include <sdbusplus/bus.hpp>
 #include <sdbusplus/server/object.hpp>
+#include <string>
 
 namespace phosphor
 {