diff --git a/src/quic_conn.c b/src/quic_conn.c
index f8c7816ec..c67ae6d54 100644
--- a/src/quic_conn.c
+++ b/src/quic_conn.c
@@ -5158,7 +5158,10 @@ struct task *qc_process_timer(struct task *task, void *ctx, unsigned int state)
 
 	if (qc->path->in_flight) {
 		pktns = quic_pto_pktns(qc, qc->state >= QUIC_HS_ST_CONFIRMED, NULL);
-		if (!qc_notify_send(qc)) {
+		if (qc_notify_send(qc)) {
+			pktns->tx.pto_probe = QUIC_MAX_NB_PTO_DGRAMS;
+		}
+		else {
 			if (pktns == &qc->pktns[QUIC_TLS_PKTNS_INITIAL]) {
 				if (qc_may_probe_ipktns(qc)) {
 					qc->flags |= QUIC_FL_CONN_RETRANS_NEEDED;