1 files changed, 3 insertions, 0 deletions
diff --git a/vis-menu.c b/vis-menu.c
index 1dd115b..0685d40 100644
--- a/vis-menu.c
+++ b/vis-menu.c
@@ -30,6 +30,9 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
+#undef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 700
+
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>