diff --git a/src/backend/backend.c b/src/backend/backend.c
index 42ce7b2..34806b1 100644
--- a/src/backend/backend.c
+++ b/src/backend/backend.c
@@ -339,6 +339,9 @@ void paint_all_new(session_t *ps, struct managed_win *t, bool ignore_damage) {
 			    &dim_opacity);
 			ps->backend_data->ops->set_image_property(
 			    ps->backend_data, IMAGE_PROPERTY_OPACITY, w->win_image, &w->opacity);
+			ps->backend_data->ops->set_image_property(
+			    ps->backend_data, IMAGE_PROPERTY_CORNER_RADIUS, w->win_image,
+			    (double[]){w->corner_radius});
 		}
 
 		if (w->opacity * MAX_ALPHA < 1) {