diff --git a/src/quic_tx.c b/src/quic_tx.c
index 421dba86c..2c1eb87c6 100644
--- a/src/quic_tx.c
+++ b/src/quic_tx.c
@@ -626,7 +626,7 @@ static int qc_prep_pkts(struct quic_conn *qc, struct buffer *buf,
 		struct quic_enc_level *next_qel;
 		int probe, must_ack;
 
-		if (qel == qc->eel) {
+		if (!qc_is_back(qc) && qel == qc->eel) {
 			/* Next encryption level */
 			continue;
 		}