diff --git a/include/haproxy/mux_quic-t.h b/include/haproxy/mux_quic-t.h
index eafa62d15..bd8b1c31c 100644
--- a/include/haproxy/mux_quic-t.h
+++ b/include/haproxy/mux_quic-t.h
@@ -92,6 +92,7 @@ struct qcc {
 #define QC_SF_BLK_MROOM         0x00000004  /* app layer is blocked waiting for room in the qcs.tx.buf */
 #define QC_SF_DETACH            0x00000008  /* cs is detached but there is remaining data to send */
 #define QC_SF_BLK_SFCTL         0x00000010  /* stream blocked due to stream flow control limit */
+#define QC_SF_DEM_FULL          0x00000020  /* demux blocked on request channel buffer full */
 
 struct qcs {
 	struct qcc *qcc;
diff --git a/src/h3.c b/src/h3.c
index fe3ae1384..61ea09a72 100644
--- a/src/h3.c
+++ b/src/h3.c
@@ -223,8 +223,10 @@ static int h3_data_to_htx(struct qcs *qcs, struct buffer *buf, uint64_t len,
 	head = b_head(buf);
  retry:
 	htx_space = htx_free_data_space(htx);
-	if (!htx_space)
+	if (!htx_space) {
+		qcs->flags |= QC_SF_DEM_FULL;
 		goto out;
+	}
 
 	if (len > htx_space) {
 		len = htx_space;
@@ -264,7 +266,7 @@ static int h3_decode_qcs(struct qcs *qcs, int fin, void *ctx)
 	if (!b_data(rxbuf))
 		return 0;
 
-	while (b_data(rxbuf)) {
+	while (b_data(rxbuf) && !(qcs->flags & QC_SF_DEM_FULL)) {
 		uint64_t ftype, flen;
 		struct buffer b;
 		char last_stream_frame = 0;
diff --git a/src/mux_quic.c b/src/mux_quic.c
index db32de146..db16ca0cf 100644
--- a/src/mux_quic.c
+++ b/src/mux_quic.c
@@ -1308,8 +1308,13 @@ static size_t qc_rcv_buf(struct conn_stream *cs, struct buffer *buf,
 		}
 	}
 
-	if (ret)
+	/* TODO QUIC MUX iocb does not treat RX : following wake-up is thus
+	 * useless for the moment. This may causes freezing transfer on POST.
+	 */
+	if (ret) {
+		qcs->flags &= ~QC_SF_DEM_FULL;
 		tasklet_wakeup(qcs->qcc->wait_event.tasklet);
+	}
 
 	TRACE_LEAVE(QMUX_EV_STRM_RECV, qcs->qcc->conn, qcs);