diff --git a/test.c b/test.c
index 8a48ac7..da587c3 100644
--- a/test.c
+++ b/test.c
@@ -18,6 +18,9 @@
  * File author: Paolo Marrone
  */
 
+#define _XOPEN_SOURCE   600
+#define _POSIX_C_SOURCE 200112L
+
 #include "vinci.h"
 
 #include <string.h>