diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h
index 192f279..07d2049 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -197,6 +197,7 @@
         struct gprs_rlcmac_tbf *tbf, uint32_t fn);
 
 struct msgb *gprs_rlcmac_send_packet_downlink_assignment(
+	struct gprs_rlcmac_bts *bts,
         struct gprs_rlcmac_tbf *tbf, uint32_t fn);
 
 void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_bts *bts,