diff --git a/testing/helpers/event.cc b/testing/helpers/event.cc
index 9ed69a4..abcf9d6 100644
--- a/testing/helpers/event.cc
+++ b/testing/helpers/event.cc
@@ -4,6 +4,7 @@
 
 #include "testing/helpers/event.h"
 
+#include <stdint.h>
 #include <stdio.h>
 
 #include <string>