diff --git a/test/thread.c b/test/thread.c
index f47bf9f22..0511f8883 100644
--- a/test/thread.c
+++ b/test/thread.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2022 Sebastian Reimers
  */
 
+#include <time.h>
 #include <re.h>
 #include "test.h"