===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/tty.c,v
retrieving revision 1.312
retrieving revision 1.313
diff -u -r1.312 -r1.313
--- src/usr.bin/tmux/tty.c	2019/01/15 12:08:53	1.312
+++ src/usr.bin/tmux/tty.c	2019/01/20 15:57:27	1.313
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty.c,v 1.312 2019/01/15 12:08:53 nicm Exp $ */
+/* $OpenBSD: tty.c,v 1.313 2019/01/20 15:57:27 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1102,7 +1102,7 @@
 		 * background colour isn't default (because it doesn't work
 		 * after SGR 0).
 		 */
-		if (tty->term_type == TTY_VT420 && COLOUR_DEFAULT(bg)) {
+		if (tty->term_type == TTY_VT420 && !COLOUR_DEFAULT(bg)) {
 			xsnprintf(tmp, sizeof tmp, "\033[32;%u;%u;%u;%u$x",
 			    py + 1, px + 1, py + ny, px + nx);
 			tty_puts(tty, tmp);