1 files changed, 1 insertions, 0 deletions

diff --git a/src/head.c b/src/head.c
index f2201b5..98e3b57 100644
--- a/src/head.c
+++ b/src/head.c
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 200809L
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>