diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.c b/src/mod/endpoints/mod_sofia/mod_sofia.c
index 9bf43d9fff..907de17a20 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.c
+++ b/src/mod/endpoints/mod_sofia/mod_sofia.c
@@ -5252,7 +5252,7 @@ static switch_call_cause_t sofia_outgoing_channel(switch_core_session_t *session
 		}
 
 		if (!(vval = switch_channel_get_variable(o_channel, "sip_copy_multipart")) || switch_true(vval)) {
-			switch_ivr_transfer_variable(session, nsession, SOFIA_MULTIPART_PREFIX_T);
+			switch_ivr_transfer_variable(session, nsession, "sip_multipart");
 		}
 		switch_ivr_transfer_variable(session, nsession, "sip_video_fmtp");
 		switch_ivr_transfer_variable(session, nsession, "sip-force-contact");