diff --git a/include/osmocore/gsm48.h b/include/osmocore/gsm48.h
index a509a09..be9fbbd 100644
--- a/include/osmocore/gsm48.h
+++ b/include/osmocore/gsm48.h
@@ -29,5 +29,6 @@
 
 /* Parse Routeing Area Identifier */
 void gsm48_parse_ra(struct gprs_ra_id *raid, const uint8_t *buf);
+int gsm48_construct_ra(uint8_t *buf, const struct gprs_ra_id *raid);
 
 #endif