1 files changed, 2 insertions, 0 deletions
diff --git a/window.c b/window.c
index 237f3f3..4a90516 100644
--- a/window.c
+++ b/window.c
@@ -16,6 +16,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#define _POSIX_C_SOURCE 200112L
+
 #include <string.h>
 #include <X11/Xutil.h>
 #include <X11/cursorfont.h>