diff --git a/src/mux_quic.c b/src/mux_quic.c
index dcbe072b6..a0d586fe5 100644
--- a/src/mux_quic.c
+++ b/src/mux_quic.c
@@ -100,11 +100,21 @@ static struct qcs *qcs_new(struct qcc *qcc, uint64_t id, enum qcs_type type)
 
 	qcs->stream = NULL;
 	qcs->qcc = qcc;
-	qcs->sd = NULL;
 	qcs->flags = QC_SF_NONE;
 	qcs->st = QC_SS_IDLE;
 	qcs->ctx = NULL;
 
+	qcs->sd = sedesc_new();
+	if (!qcs->sd)
+		goto err;
+	qcs->sd->se   = qcs;
+	qcs->sd->conn = qcc->conn;
+	se_fl_set(qcs->sd, SE_FL_T_MUX | SE_FL_ORPHAN | SE_FL_NOT_FIRST);
+	se_expect_no_data(qcs->sd);
+
+	if (!(global.tune.no_zero_copy_fwd & NO_ZERO_COPY_FWD_QUIC_SND))
+		se_fl_set(qcs->sd, SE_FL_MAY_FASTFWD_CONS);
+
 	/* App callback attach may register the stream for http-request wait.
 	 * These fields must be initialed before.
 	 */
@@ -692,17 +702,6 @@ struct stconn *qcs_attach_sc(struct qcs *qcs, struct buffer *buf, char fin)
 	struct qcc *qcc = qcs->qcc;
 	struct session *sess = qcc->conn->owner;
 
-	qcs->sd = sedesc_new();
-	if (!qcs->sd)
-		return NULL;
-
-	qcs->sd->se   = qcs;
-	qcs->sd->conn = qcc->conn;
-	se_fl_set(qcs->sd, SE_FL_T_MUX | SE_FL_ORPHAN | SE_FL_NOT_FIRST);
-	se_expect_no_data(qcs->sd);
-
-	if (!(global.tune.no_zero_copy_fwd & NO_ZERO_COPY_FWD_QUIC_SND))
-		se_fl_set(qcs->sd, SE_FL_MAY_FASTFWD_CONS);
 
 	/* TODO duplicated from mux_h2 */
 	sess->t_idle = ns_to_ms(now_ns - sess->accept_ts) - sess->t_handshake;