diff --git a/src/tbf_ul.h b/src/tbf_ul.h
index 9396633..2bc908d 100644
--- a/src/tbf_ul.h
+++ b/src/tbf_ul.h
@@ -54,6 +54,7 @@
 
 struct gprs_rlcmac_ul_tbf : public gprs_rlcmac_tbf {
 	gprs_rlcmac_ul_tbf(struct gprs_rlcmac_bts *bts, GprsMs *ms);
+	~gprs_rlcmac_ul_tbf();
 	gprs_rlc_window *window();
 	struct msgb *create_ul_ack(uint32_t fn, uint8_t ts);
 	bool ctrl_ack_to_toggle();