diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 6fe82e0dca..e882fb54ad 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -8552,7 +8552,7 @@ static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr
 				transmit_fake_auth_response(p, &p->initreq, 1);
 			} else {
 				/* URI not found */
-				if (res == AUTH_UNKNOWN_DOMAIN || res == AUTH_PEER_NOT_DYNAMIC)
+				if (res == AUTH_PEER_NOT_DYNAMIC)
 					transmit_response(p, "403 Forbidden", &p->initreq);
 				else
 					transmit_response(p, "404 Not found", &p->initreq);