1 files changed, 2 insertions, 0 deletions

diff --git a/toxcore/util.c b/toxcore/util.c
index 7a390ea9..1d2a85dc 100644
--- a/toxcore/util.c
+++ b/toxcore/util.c
@@ -22,6 +22,8 @@
  *  along with Tox.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _XOPEN_SOURCE 600
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif