diff --git a/src/utils/timed_events.hpp b/src/utils/timed_events.hpp
index aafe532..4e2800c 100644
--- a/src/utils/timed_events.hpp
+++ b/src/utils/timed_events.hpp
@@ -2,6 +2,7 @@
 # define TIMED_EVENTS_HPP
 
 #include <functional>
+#include <string>
 #include <chrono>
 #include <list>