diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9958e293..7ef784f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -75,6 +75,7 @@
   compositors without `cursor-shape-v1 support` ([#1411][1411]).
 * Crash on exit, if the mouse is hovering over the foot window (does
   not happen on all compositors)
+* Visual glitches when CSD titlebar is transparent.
 
 [1404]: https://codeberg.org/dnkl/foot/issues/1404
 [1411]: https://codeberg.org/dnkl/foot/pulls/1411
diff --git a/render.c b/render.c
index 7d7c6348..11c2456a 100644
--- a/render.c
+++ b/render.c
@@ -1953,12 +1953,15 @@ render_osd(struct terminal *term, const struct wayl_sub_surface *sub_surf,
     wl_surface_attach(sub_surf->surface.surf, buf->wl_buf, 0, 0);
     wl_surface_damage_buffer(sub_surf->surface.surf, 0, 0, buf->width, buf->height);
 
-    struct wl_region *region = wl_compositor_create_region(term->wl->compositor);
-    if (region != NULL) {
-        wl_region_add(region, 0, 0, buf->width, buf->height);
-        wl_surface_set_opaque_region(sub_surf->surface.surf, region);
-        wl_region_destroy(region);
-    }
+    if (alpha == 0xffff) {
+        struct wl_region *region = wl_compositor_create_region(term->wl->compositor);
+        if (region != NULL) {
+            wl_region_add(region, 0, 0, buf->width, buf->height);
+            wl_surface_set_opaque_region(sub_surf->surface.surf, region);
+            wl_region_destroy(region);
+        }
+    } else
+        wl_surface_set_opaque_region(sub_surf->surface.surf, NULL);
 
     wl_surface_commit(sub_surf->surface.surf);
     quirk_weston_subsurface_desync_off(sub_surf->sub);