1 files changed, 1 insertions, 1 deletions

diff --git a/cat.c b/cat.c
index b9c45cf..15346d8 100644
--- a/cat.c
+++ b/cat.c
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-#define _XOPEN_SOURCE 700
+#define _POSIX_C_SOURCE 2
 #include <errno.h>
 #include <locale.h>
 #include <stdio.h>