| diff --git a/lib/quicly.c b/lib/quicly.c |
| index 95d5f13..200515f 100644 |
| --- a/lib/quicly.c |
| +++ b/lib/quicly.c |
| @@ -3551,6 +3551,10 @@ static int handle_ack_frame(quicly_conn_t *conn, struct st_quicly_handle_payload |
| |
| QUICLY_PROBE(QUICTRACE_RECV_ACK_DELAY, conn, probe_now(), frame.ack_delay); |
| |
| + /* Detect and fix time skew */ |
| + if (now < largest_newly_acked.sent_at) |
| + now = largest_newly_acked.sent_at; |
| + |
| /* Update loss detection engine on ack. The function uses ack_delay only when the largest_newly_acked is also the largest acked |
| * so far. So, it does not matter if the ack_delay being passed in does not apply to the largest_newly_acked. */ |
| quicly_loss_on_ack_received(&conn->egress.loss, largest_newly_acked.packet_number, now, largest_newly_acked.sent_at, |