diff --git a/image-sixel.c b/image-sixel.c
index f687a51d8..9cd317316 100644
--- a/image-sixel.c
+++ b/image-sixel.c
@@ -1349,13 +1349,6 @@ sixel_free_output(struct tty *tty, __unused int send)
 	tty->image_data = NULL;
 }
 
-/* Discard SIXEL output state after a terminal geometry change. */
-void
-sixel_geometry_changed(struct tty *tty)
-{
-	sixel_free_output(tty, !!(tty->flags & TTY_OPENED));
-}
-
 /* Render an image at a terminal's current pixel geometry. */
 static struct sixel_image *
 sixel_render_image(struct image *im, u_int cell_w, u_int cell_h)
diff --git a/image.c b/image.c
index 1f53a63b5..5ef9dfcc3 100644
--- a/image.c
+++ b/image.c
@@ -87,16 +87,14 @@ struct image_backend {
 	void		(*draw_rect)(struct tty *,
 		    const struct image_rect *, const struct tty_style_ctx *);
 	void		(*free)(struct tty *, int);
-	void		(*geometry_changed)(struct tty *);
 };
 
 static const struct image_backend image_backend_ascii = {
-	"ascii", IMAGE_BACKEND_SCROLLS, NULL, NULL, NULL
+	"ascii", IMAGE_BACKEND_SCROLLS, NULL, NULL
 };
 static const struct image_backend image_backend_sixel = {
 	"sixel", IMAGE_BACKEND_GRAPHICAL|IMAGE_BACKEND_TEMPORAL,
-	sixel_draw_rect,
-	sixel_free_output, sixel_geometry_changed
+	sixel_draw_rect, sixel_free_output
 };
 
 /* Compare images by server ID. */
@@ -152,8 +150,8 @@ void
 image_tty_geometry_changed(struct tty *tty)
 {
 	image_tty_update(tty);
-	if (tty->image_backend->geometry_changed != NULL)
-		tty->image_backend->geometry_changed(tty);
+	if (tty->image_backend->free != NULL)
+		tty->image_backend->free(tty, !!(tty->flags & TTY_OPENED));
 }
 
 /* Free image backend state for a terminal. */
diff --git a/tmux.h b/tmux.h
index 638737cd0..2462a5f5f 100644
--- a/tmux.h
+++ b/tmux.h
@@ -4259,9 +4259,8 @@ void		 image_rect_get_coords(const struct image_rect *,
 /* image-sixel.c */
 #define SIXEL_COLOUR_REGISTERS 1024
 void		 sixel_draw_rect(struct tty *,
-			     const struct image_rect *, const struct tty_style_ctx *);
+		     const struct image_rect *, const struct tty_style_ctx *);
 void		 sixel_free_output(struct tty *, int);
-void		 sixel_geometry_changed(struct tty *);
 struct sixel_image *sixel_parse(const char *, size_t, u_int, u_int, u_int,
     u_int);
 void		 sixel_free(struct sixel_image *);