diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index eefcf61..ea1f759 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -656,6 +656,7 @@
 osmo_cbsp_encode;
 osmo_cbsp_decode;
 osmo_cbsp_recv_buffered;
+osmo_cbsp_errstr;
 
 local: *;
 };