diff --git a/include/osmocom/gprs/gprs_ns.h b/include/osmocom/gprs/gprs_ns.h
index c62ef98..ed155ff 100644
--- a/include/osmocom/gprs/gprs_ns.h
+++ b/include/osmocom/gprs/gprs_ns.h
@@ -211,6 +211,8 @@
 
 /* Resturn peer info as string (NOTE: the buffer is allocated statically) */
 const char *gprs_ns_ll_str(const struct gprs_nsvc *nsvc);
+/* Return peer info in user-supplied buffer */
+char *gprs_ns_ll_str_buf(char *buf, size_t buf_len, const struct gprs_nsvc *nsvc);
 
 /* Copy the link layer info from other into nsvc */
 void gprs_ns_ll_copy(struct gprs_nsvc *nsvc, struct gprs_nsvc *other);