diff --git a/screen-write.c b/screen-write.c
index 14cbd4d5..6631ab56 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -943,9 +943,9 @@ screen_write_clearstartofscreen(struct screen_write_ctx *ctx, u_int bg)
 	if (s->cy > 0)
 		grid_view_clear(s->grid, 0, 0, sx, s->cy, bg);
 	if (s->cx > sx - 1)
-		grid_view_clear(s->grid, 0, s->cy, sx, 1, 8);
+		grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
 	else
-		grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, 8);
+		grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg);
 
 	screen_write_collect_clear(ctx, 0, s->cy);
 	screen_write_collect_flush(ctx, 0);
diff --git a/tty.c b/tty.c
index 5fb56148..18e4c3d2 100644
--- a/tty.c
+++ b/tty.c
@@ -846,9 +846,13 @@ tty_draw_line(struct tty *tty, const struct window_pane *wp,
 	tty_region_off(tty);
 	tty_margin_off(tty);
 
+	/*
+	 * Clamp the width to cellsize - note this is not cellused, because
+	 * there may be empty background cells after it (from BCE).
+	 */
 	sx = screen_size_x(s);
-	if (sx > s->grid->linedata[s->grid->hsize + py].cellused)
-		sx = s->grid->linedata[s->grid->hsize + py].cellused;
+	if (sx > s->grid->linedata[s->grid->hsize + py].cellsize)
+		sx = s->grid->linedata[s->grid->hsize + py].cellsize;
 	if (sx > tty->sx)
 		sx = tty->sx;