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
diff --git a/src/gsm_04_08.c b/src/gsm_04_08.c
index e2cba5b..69207d7 100644
--- a/src/gsm_04_08.c
+++ b/src/gsm_04_08.c
@@ -188,7 +188,7 @@
 	return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM);
 }
 
-static int gsm48_sendmsg(struct msgb *msg)
+int gsm48_sendmsg(struct msgb *msg)
 {
 	struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data;