diff --git a/screen-write.c b/screen-write.c
index 7df389867..8234d7198 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: screen-write.c,v 1.300 2026/10/12 18:47:52 nicm Exp $ */
+/* $OpenBSD: screen-write.c,v 1.301 2026/10/14 13:36:37 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1407,7 +1407,8 @@ screen_write_sync_redraw_cb(const struct tty_ctx *ttyctx, u_int py, u_int ny)
 {
 	struct window_pane	*wp = ttyctx->arg;
 
-	bit_nset(wp->sync_dirty, py, py + ny - 1);
+	if (ny != 0)
+		bit_nset(wp->sync_dirty, py, py + ny - 1);
 }
 
 /* Send the deferred scroll to the client. */
diff --git a/tty-features.c b/tty-features.c
index 3e2702f7e..832e975ba 100644
--- a/tty-features.c
+++ b/tty-features.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty-features.c,v 1.49 2026/10/14 12:33:46 nicm Exp $ */
+/* $OpenBSD: tty-features.c,v 1.50 2026/10/14 13:36:37 nicm Exp $ */
 
 /*
  * Copyright (c) 2020 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -668,6 +668,7 @@ tty_default_features(struct client *c, const char *name, u_int version)
 			      "cstyle,"
 			      "extkeys,"
 			      "focus,"
+			      "imagescroll,"
 			      "margins,"
 			      "overline,"
 			      "hyperlinks,"
@@ -684,6 +685,7 @@ tty_default_features(struct client *c, const char *name, u_int version)
 			      "extkeys,"
 			      "focus,"
 			      "hyperlinks,"
+			      "imagescroll,"
 			      "osc7,"
 			      "sync,"
 			      "usstyle,"