diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index 7b6b932fb4aaa1af297564217b47b68ba37793a9..13acb8c98a232c7988435f9be39898d3df422dc2 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -365,5 +365,6 @@ hb_subset (hb_face_t *source,
     }
   } while (count == ARRAY_LENGTH (table_tags));
 
+  hb_subset_plan_destroy (plan);
   return success ? dest : hb_face_get_empty ();
 }