diff --git a/screen-write.c b/screen-write.c
index b57b0620..033a1a52 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -605,11 +605,11 @@ screen_write_clearstartofscreen(struct screen_write_ctx *ctx)
 	sx = screen_size_x(s);
 
 	if (s->cy > 0)
-		grid_view_clear(s->grid, 0, 0, sx, s->cy - 1);
+		grid_view_clear(s->grid, 0, 0, sx, s->cy);
 	if (s->cx > sx - 1)
 		grid_view_clear(s->grid, 0, s->cy, sx, 1);
 	else
-		grid_view_clear(s->grid, 0, s->cy, s->cx, 1);
+		grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1);
 
 	tty_write_cmd(ctx->wp, TTY_CLEARSTARTOFSCREEN);
 }
diff --git a/tty.c b/tty.c
index 06ce9248..16a865eb 100644
--- a/tty.c
+++ b/tty.c
@@ -797,7 +797,7 @@ tty_cmd_clearstartofscreen(
 				tty_putc(tty, ' ');
 		}
 	}
-	for (i = 0; i < s->old_cx; i++)
+	for (i = 0; i <= s->old_cx; i++)
 		tty_putc(tty, ' ');
 }