diff --git a/include/openbsc/gsm_04_08.h b/include/openbsc/gsm_04_08.h
index 8265219..3ef4fdb 100644
--- a/include/openbsc/gsm_04_08.h
+++ b/include/openbsc/gsm_04_08.h
@@ -393,6 +393,7 @@
 
 int gsm48_tx_mm_info(struct gsm_lchan *lchan);
 struct msgb *gsm48_msgb_alloc(void);
+int gsm48_sendmsg(struct msgb *msg);
 
 
 #endif