diff --git a/src/basic/async.h b/src/basic/async.h
index cf80acf..d22e77d 100644
--- a/src/basic/async.h
+++ b/src/basic/async.h
@@ -2,6 +2,7 @@
 #pragma once
 
 #include <sys/types.h>
+#include <signal.h>
 
 #include "macro.h"
 
