diff --git a/src/quic_tx.c b/src/quic_tx.c
index 9f87aac67..b8de12a57 100644
--- a/src/quic_tx.c
+++ b/src/quic_tx.c
@@ -2243,8 +2243,8 @@ static int qc_do_build_pkt(unsigned char *pos, const unsigned char *end,
 	ack_frm_len = 0;
 	/* Do not ack and probe at the same time. */
 	if ((must_ack || (qel->pktns->flags & QUIC_FL_PKTNS_ACK_REQUIRED)) && !qel->pktns->tx.pto_probe) {
-	    struct quic_arngs *arngs = &qel->pktns->rx.arngs;
-	    BUG_ON(eb_is_empty(&qel->pktns->rx.arngs.root));
+		struct quic_arngs *arngs = &qel->pktns->rx.arngs;
+		BUG_ON(eb_is_empty(&qel->pktns->rx.arngs.root));
 		ack_frm.tx_ack.arngs = arngs;
 		if (qel->pktns->flags & QUIC_FL_PKTNS_NEW_LARGEST_PN) {
 			qel->pktns->tx.ack_delay =