diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 951cbcb..49db282 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -544,6 +544,7 @@
 osmo_dump_gsmtime;
 osmo_dump_gsmtime_buf;
 osmo_dump_gsmtime_c;
+gsm_rfn2fn;
 
 gsm_milenage;
 gsm_septet_encode;