diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 8b2096e218aff176fc631ee4f5aac12f35180cde..e25727f585fe1dba8d48bb2563b907fcc78aac76 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -1588,8 +1588,8 @@ static int retrans_pkt(void *data)
 	pkt->retransid = -1;
 
 	if (ast_test_flag(pkt, FLAG_FATAL)) {
-		while(pkt->owner->owner && ast_mutex_trylock(&pkt->owner->owner->lock)) {
-			ast_mutex_unlock(&pkt->owner->lock);
+		while(pkt->owner->owner && ast_channel_trylock(pkt->owner->owner)) {
+			ast_mutex_unlock(&pkt->owner->lock);	/* SIP_PVT, not channel */
 			usleep(1);
 			ast_mutex_lock(&pkt->owner->lock);
 		}
@@ -7186,7 +7186,7 @@ static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *t
 					sip_pvt_ptr->theirtag, sip_pvt_ptr->tag);
 
 			/* deadlock avoidance... */
-			while (sip_pvt_ptr->owner && ast_mutex_trylock(&sip_pvt_ptr->owner->lock)) {
+			while (sip_pvt_ptr->owner && ast_channel_trylock(sip_pvt_ptr->owner)) {
 				ast_mutex_unlock(&sip_pvt_ptr->lock);
 				usleep(1);
 				ast_mutex_lock(&sip_pvt_ptr->lock);