1 files changed, 2 insertions, 0 deletions

diff --git a/lineset.c b/lineset.c
index 4710c59..595ccba 100644
--- a/lineset.c
+++ b/lineset.c
@@ -1,3 +1,5 @@
+#define _POSIX_C_SOURCE 200112L
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>