diff --git a/include/osmocore/gsmtap_util.h b/include/osmocore/gsmtap_util.h
index 30fc126..9644944 100644
--- a/include/osmocore/gsmtap_util.h
+++ b/include/osmocore/gsmtap_util.h
@@ -7,6 +7,11 @@
 uint8_t chantype_rsl2gsmtap(uint8_t rsl_chantype, uint8_t rsl_link_id);
 
 /* receive a message from L1/L2 and put it in GSMTAP */
+struct msgb *gsmtap_makemsg(uint16_t arfcn, uint8_t ts, uint8_t chan_type,
+			    uint8_t ss, uint32_t fn, int8_t signal_dbm,
+			    uint8_t snr, const uint8_t *data, unsigned int len);
+
+/* receive a message from L1/L2 and put it in GSMTAP */
 int gsmtap_sendmsg(uint16_t arfcn, uint8_t ts, uint8_t chan_type, uint8_t ss,
 		   uint32_t fn, int8_t signal_dbm, uint8_t snr,
 		   const uint8_t *data, unsigned int len);