diff --git a/tty.c b/tty.c
index 04ebc72d..0fd0ce71 100644
--- a/tty.c
+++ b/tty.c
@@ -2634,8 +2634,7 @@ tty_attributes(struct tty *tty, const struct grid_cell *gc,
 	if (changed & GRID_ATTR_ITALICS)
 		tty_set_italics(tty);
 	if (changed & GRID_ATTR_ALL_UNDERSCORE) {
-		if ((changed & GRID_ATTR_UNDERSCORE) ||
-		    !tty_term_has(tty->term, TTYC_SMULX))
+		if (changed & GRID_ATTR_UNDERSCORE)
 			tty_putcode(tty, TTYC_SMUL);
 		else if (changed & GRID_ATTR_UNDERSCORE_2)
 			tty_putcode_i(tty, TTYC_SMULX, 2);