diff --git a/include/haproxy/xprt_quic-t.h b/include/haproxy/xprt_quic-t.h
index 0e2d9d8da..e9ad9113b 100644
--- a/include/haproxy/xprt_quic-t.h
+++ b/include/haproxy/xprt_quic-t.h
@@ -405,8 +405,6 @@ struct quic_pktns {
 		struct list frms;
 		/* Next packet number to use for transmissions. */
 		int64_t next_pn;
-		/* Largest acked sent packet. */
-		int64_t largest_acked_pn;
 		/* The packet which has been sent. */
 		struct eb_root pkts;
 		/* The time the most recent ack-eliciting packer was sent. */
@@ -421,6 +419,8 @@ struct quic_pktns {
 	struct {
 		/* Largest packet number */
 		int64_t largest_pn;
+		/* Largest acked sent packet. */
+		int64_t largest_acked_pn;
 		struct quic_arngs arngs;
 	} rx;
 	unsigned int flags;
@@ -534,6 +534,8 @@ struct quic_tx_packet {
 	int refcnt;
 	/* Next packet in the same datagram */
 	struct quic_tx_packet *next;
+	/* Largest acknowledged packet number if this packet contains an ACK frame */
+	int64_t largest_acked_pn;
 	unsigned char type;
 };
 
diff --git a/include/haproxy/xprt_quic.h b/include/haproxy/xprt_quic.h
index 115691287..d95a072e4 100644
--- a/include/haproxy/xprt_quic.h
+++ b/include/haproxy/xprt_quic.h
@@ -978,12 +978,12 @@ static inline void quic_pktns_init(struct quic_pktns *pktns)
 	LIST_INIT(&pktns->tx.frms);
 	pktns->tx.next_pn = -1;
 	pktns->tx.pkts = EB_ROOT_UNIQUE;
-	pktns->tx.largest_acked_pn = -1;
 	pktns->tx.time_of_last_eliciting = 0;
 	pktns->tx.loss_time = TICK_ETERNITY;
 	pktns->tx.in_flight = 0;
 
 	pktns->rx.largest_pn = -1;
+	pktns->rx.largest_acked_pn = -1;
 	pktns->rx.arngs.root = EB_ROOT_UNIQUE;
 	pktns->rx.arngs.sz = 0;
 	pktns->rx.arngs.enc_sz = 0;
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index d53bb5f05..ddd0b01f8 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -1699,7 +1699,7 @@ static void qc_packet_loss_lookup(struct quic_pktns *pktns,
 		unsigned int loss_time_limit, time_sent;
 
 		pkt = eb64_entry(&node->node, struct quic_tx_packet, pn_node);
-		largest_acked_pn = HA_ATOMIC_LOAD(&pktns->tx.largest_acked_pn);
+		largest_acked_pn = HA_ATOMIC_LOAD(&pktns->rx.largest_acked_pn);
 		node = eb64_next(node);
 		if ((int64_t)pkt->pn_node.key > largest_acked_pn)
 			break;
@@ -1762,7 +1762,7 @@ static inline int qc_parse_ack_frm(struct quic_conn *qc,
 	largest_node = NULL;
 	time_sent = 0;
 
-	if ((int64_t)ack->largest_ack > HA_ATOMIC_LOAD(&qel->pktns->tx.largest_acked_pn)) {
+	if ((int64_t)ack->largest_ack > HA_ATOMIC_LOAD(&qel->pktns->rx.largest_acked_pn)) {
 		largest_node = eb64_lookup(pkts, largest);
 		if (!largest_node) {
 			TRACE_DEVEL("Largest acked packet not found",
@@ -1817,7 +1817,7 @@ static inline int qc_parse_ack_frm(struct quic_conn *qc,
 
 	if (time_sent && (pkt_flags & QUIC_FL_TX_PACKET_ACK_ELICITING)) {
 		*rtt_sample = tick_remain(time_sent, now_ms);
-		HA_ATOMIC_STORE(&qel->pktns->tx.largest_acked_pn, ack->largest_ack);
+		HA_ATOMIC_STORE(&qel->pktns->rx.largest_acked_pn, ack->largest_ack);
 	}
 
 	if (!LIST_ISEMPTY(&newly_acked_pkts)) {
@@ -5036,7 +5036,7 @@ static int qc_do_build_pkt(unsigned char *pos, const unsigned char *end,
 		goto no_room;
 
 	end -= QUIC_TLS_TAG_LEN;
-	largest_acked_pn = HA_ATOMIC_LOAD(&qel->pktns->tx.largest_acked_pn);
+	largest_acked_pn = HA_ATOMIC_LOAD(&qel->pktns->rx.largest_acked_pn);
 	/* packet number length */
 	*pn_len = quic_packet_number_length(pn, largest_acked_pn);
 	/* Build the header */