structure comparison functions
diff --git a/skeletons/constr_SET.h b/skeletons/constr_SET.h
index 702bc05..4bafffe 100644
--- a/skeletons/constr_SET.h
+++ b/skeletons/constr_SET.h
@@ -47,6 +47,7 @@
  */
 asn_struct_free_f SET_free;
 asn_struct_print_f SET_print;
+asn_struct_compare_f SET_compare;
 asn_constr_check_f SET_constraint;
 ber_type_decoder_f SET_decode_ber;
 der_type_encoder_f SET_encode_der;