diff --git a/render.c b/render.c
index c65cc7e9..a7297412 100644
--- a/render.c
+++ b/render.c
@@ -2290,8 +2290,6 @@ grid_render(struct terminal *term)
         xassert(tll_length(term->render.workers.queue) == 0);
     }
 
-    pixman_region32_clear(&buf->dirty);
-
     int first_dirty_row = -1;
     for (int r = 0; r < term->rows; r++) {
         struct row *row = grid_row_in_view(term->grid, r);
diff --git a/shm.c b/shm.c
index 4b503d22..ed20af3a 100644
--- a/shm.c
+++ b/shm.c
@@ -250,6 +250,7 @@ shm_get_buffer(struct wl_shm *shm, int width, int height, unsigned long cookie,
                         cookie, (void *)&it->item);
                 it->item.busy = true;
                 it->item.purge = false;
+                pixman_region32_clear(&it->item.dirty);
                 free(it->item.scroll_damage);
                 it->item.scroll_damage = NULL;
                 xassert(it->item.pix_instances == pix_instances);