diff --git a/include/osmocom/msc/transaction_cc.h b/include/osmocom/msc/transaction_cc.h
index 0d25b31..1f2f8c1 100644
--- a/include/osmocom/msc/transaction_cc.h
+++ b/include/osmocom/msc/transaction_cc.h
@@ -32,4 +32,5 @@
 
 void trans_cc_filter_init(struct gsm_trans *trans);
 void trans_cc_filter_set_ran(struct gsm_trans *trans, enum osmo_rat_type ran_type);
+void trans_cc_filter_set_bss(struct gsm_trans *trans, struct msc_a *msc_a);
 void trans_cc_filter_set_ms_from_bc(struct gsm_trans *trans, const struct gsm_mncc_bearer_cap *bcap);