diff --git a/src/gprs_ms.h b/src/gprs_ms.h
index cdb23bf..03508ff 100644
--- a/src/gprs_ms.h
+++ b/src/gprs_ms.h
@@ -95,7 +95,7 @@
 	struct nacc_fsm_ctx *nacc;
 };
 
-struct GprsMs *ms_alloc(struct gprs_rlcmac_bts *bts);
+struct GprsMs *ms_alloc(struct gprs_rlcmac_bts *bts, const char *use_ref);
 
 struct gprs_rlcmac_pdch *ms_first_common_ts(const struct GprsMs *ms);
 void ms_set_first_common_ts(struct GprsMs *ms, struct gprs_rlcmac_pdch *pdch);