--- a/lib/tty/tty-ncurses.h
+++ b/lib/tty/tty-ncurses.h
@@ -3,6 +3,7 @@
#define MC__TTY_NCURSES_H
#ifdef USE_NCURSES
+#define _XOPEN_SOURCE_EXTENDED
#ifdef HAVE_NCURSES_CURSES_H
#include <ncurses/curses.h>
#elif defined (HAVE_NCURSES_NCURSES_H)