diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 02c8884..b7c5158 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -44,6 +44,7 @@
 gsm0480_create_unstructuredSS_Notify;
 gsm0480_create_ussd_resp;
 gsm0480_decode_ussd_request;
+gsm0480_decode_ss_request;
 gsm0480_wrap_facility;
 gsm0480_wrap_invoke;