diff --git a/src/tbf_ul_ack_fsm.h b/src/tbf_ul_ack_fsm.h
index f25972e..e06728e 100644
--- a/src/tbf_ul_ack_fsm.h
+++ b/src/tbf_ul_ack_fsm.h
@@ -22,6 +22,7 @@
 
 struct gprs_rlcmac_tbf;
 struct gprs_rlcmac_ul_tbf;
+struct gprs_rlcmac_pdch;
 
 enum tbf_ul_ack_fsm_event {
 	TBF_UL_ACK_EV_SCHED_ACK, /* Tx UL ACK/NACK is pending */
@@ -63,6 +64,6 @@
 
 
 struct msgb *tbf_ul_ack_create_rlcmac_msg(const struct gprs_rlcmac_ul_tbf *ul_tbf, uint32_t fn, uint8_t ts);
-bool tbf_ul_ack_rts(const struct gprs_rlcmac_ul_tbf *ul_tbf);
+bool tbf_ul_ack_rts(const struct gprs_rlcmac_ul_tbf *ul_tbf, const struct gprs_rlcmac_pdch *pdch);
 bool tbf_ul_ack_waiting_cnf_final_ack(const struct gprs_rlcmac_ul_tbf *ul_tbf);
 bool tbf_ul_ack_exp_ctrl_ack(const struct gprs_rlcmac_ul_tbf *ul_tbf, uint32_t fn, uint8_t ts);