diff --git a/source/blender/bmesh/operators/bmo_dupe.cc b/source/blender/bmesh/operators/bmo_dupe.cc
index c7d63578b1a..b9939cfe648 100644
--- a/source/blender/bmesh/operators/bmo_dupe.cc
+++ b/source/blender/bmesh/operators/bmo_dupe.cc
@@ -488,6 +488,8 @@ void bmo_split_exec(BMesh *bm, BMOperator *op)
 
   /* now we make our outputs by copying the dupe output */
   BMO_slot_copy(&dupeop, slots_out, "geom.out", splitop, slots_out, "geom.out");
+  BMO_slot_copy(&dupeop, slots_out, "boundary_map.out", splitop, slots_out, "boundary_map.out");
+  BMO_slot_copy(&dupeop, slots_out, "isovert_map.out", splitop, slots_out, "isovert_map.out");
 
   /* cleanup */
   BMO_op_finish(bm, &dupeop);