1 files changed, 1 insertions, 1 deletions
diff --git a/src/util.c b/src/util.c
index ce668fc..c667a1b 100644
--- a/src/util.c
+++ b/src/util.c
@@ -6,7 +6,7 @@
  * of the MIT license.  See the LICENSE file for details.
  */
 
-#define _XOPEN_SOURCE 500
+#define _XOPEN_SOURCE 600
 #include <assert.h>
 #include <errno.h>
 #include <stdarg.h>