diff --git a/image.c b/image.c
index a2e5df15b..84ab233fb 100644
--- a/image.c
+++ b/image.c
@@ -286,7 +286,7 @@ image_get_canvas_size(const struct image *im, u_int *width,
 
 /* Return an image's cell dimensions. */
 void
-image_get_cell_size(const struct image *im, u_int *sx, u_int *sy)
+image_get_size_in_cells(const struct image *im, u_int *sx, u_int *sy)
 {
 	if (sx != NULL)
 		*sx = im->sx;
diff --git a/tmux.h b/tmux.h
index 1ae943147..28a658ce6 100644
--- a/tmux.h
+++ b/tmux.h
@@ -4251,7 +4251,7 @@ u_short		 image_get_grid_id(u_int);
 u_int		 image_get_id_by_grid_id(u_short);
 void		 image_get_size(const struct image *, u_int *, u_int *);
 void		 image_get_canvas_size(const struct image *, u_int *, u_int *);
-void		 image_get_cell_size(const struct image *, u_int *, u_int *);
+void		 image_get_size_in_cells(const struct image *, u_int *, u_int *);
 const u_char	*image_get_pixels(const struct image *, size_t *, size_t *);
 struct sixel_image *image_get_sixel(const struct image *);
 void		 image_set_sixel(struct image *, struct sixel_image *);