diff --git a/src/core/timing_event.h b/src/core/timing_event.h
index 3a9111fd3..252753c0d 100644
--- a/src/core/timing_event.h
+++ b/src/core/timing_event.h
@@ -1,6 +1,7 @@
 #pragma once
 #include <functional>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "types.h"