Minor
diff --git a/src/hb-set.cc b/src/hb-set.cc
index 3b1c5bd..0a0bc61 100644
--- a/src/hb-set.cc
+++ b/src/hb-set.cc
@@ -67,6 +67,8 @@
 {
   if (!hb_object_destroy (set)) return;
 
+  set->fini ();
+
   free (set);
 }