diff --git a/src/mod/endpoints/mod_sofia/sofia_glue.c b/src/mod/endpoints/mod_sofia/sofia_glue.c
index 3a215c3529..9bc9ae02ff 100644
--- a/src/mod/endpoints/mod_sofia/sofia_glue.c
+++ b/src/mod/endpoints/mod_sofia/sofia_glue.c
@@ -621,7 +621,7 @@ void sofia_glue_set_local_sdp(private_object_t *tech_pvt, const char *ip, switch
 					cur_ptime = this_ptime;			
 					
 					if ((!zstr(tech_pvt->local_crypto_key) && sofia_test_flag(tech_pvt, TFLAG_SECURE))) {
-						generate_m(tech_pvt, buf, sizeof(buf), port, cur_ptime, append_audio, sr, use_cng, cng_type, map, verbose_sdp, 1);
+						generate_m(tech_pvt, bp, sizeof(buf) - strlen(buf), port, cur_ptime, append_audio, sr, use_cng, cng_type, map, verbose_sdp, 1);
 						bp = (buf + strlen(buf));
 
 						/* asterisk can't handle AVP and SAVP in sep streams, way to blow off the spec....*/