diff --git a/tests/05read.c b/tests/05read.c
index bd7d07c..226acca 100644
--- a/tests/05read.c
+++ b/tests/05read.c
@@ -1,5 +1,8 @@
+#define _XOPEN_SOURCE
+
 #include <stdio.h>
 #include <errno.h>
+#include <unistd.h>
 #include "../termo.h"
 #include "taplib.h"