diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 76c701a91e..9ced0cc6cd 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -9242,6 +9242,7 @@ static void *pri_dchannel(void *vpri)
 						if (pri->pvts[chanpos]->call == e->ring.call) {
 							ast_log(LOG_WARNING, "Duplicate setup requested on channel %d/%d already in use on span %d\n", 
 								PRI_SPAN(e->ring.channel), PRI_CHANNEL(e->ring.channel), pri->span);
+							ast_mutex_unlock(&pri->pvts[chanpos]->lock);
 							break;
 						} else {
 							/* This is where we handle initial glare */