-#define NulChar 0,0,0,0 /* FIXME: see CCHARW_MAX */
+#if CCHARW_MAX > 6
+#define NulChar 0,0,0,0,0
+#elif CCHARW_MAX > 5
+#define NulChar 0,0,0,0 /* ncurses7 */
+#elif CCHARW_MAX > 4
+#define NulChar 0,0,0 /* ncurses6 */
+#elif CCHARW_MAX > 3
+#define NulChar 0,0
+#elif CCHARW_MAX > 2
+#define NulChar 0
+#else
+#define NulChar /* nothing */
+#endif
+