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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,
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