diff --git a/src/tbf_ul.h b/src/tbf_ul.h
index a581f27..606551c 100644
--- a/src/tbf_ul.h
+++ b/src/tbf_ul.h
@@ -50,7 +50,7 @@
 #define LOGPTBFUL(tbf, level, fmt, args...) LOGP(DTBFUL, level, "%s " fmt, tbf_name(tbf), ## args)
 
 struct gprs_rlcmac_ul_tbf : public gprs_rlcmac_tbf {
-	gprs_rlcmac_ul_tbf(BTS *bts);
+	gprs_rlcmac_ul_tbf(BTS *bts, GprsMs *ms);
 	gprs_rlc_window *window();
 	struct msgb *create_ul_ack(uint32_t fn, uint8_t ts);
 	bool ctrl_ack_to_toggle();