diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 8bd0dbf..e0d9dcb 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -309,5 +309,8 @@
 osmo_apn_to_str;
 osmo_apn_from_str;
 
+osmo_gsup_encode;
+osmo_gsup_decode;
+
 local: *;
 };