diff --git a/misc/cgo/testcarchive/main3.c b/misc/cgo/testcarchive/main3.c
index 5a1a60d4cd..60a16cf5fc 100644
--- a/misc/cgo/testcarchive/main3.c
+++ b/misc/cgo/testcarchive/main3.c
@@ -11,6 +11,7 @@
 #include <string.h>
 #include <time.h>
 #include <sched.h>
+#include <unistd.h>
 
 #include "libgo3.h"