diff --git a/src/event.h b/src/event.h
index 8979402..9b5fcb8 100644
--- a/src/event.h
+++ b/src/event.h
@@ -20,6 +20,7 @@
 
 #pragma once
 
+#include <string>
 #include <unordered_map>
 #include <vector>