diff --git a/include/haproxy/mux_quic-t.h b/include/haproxy/mux_quic-t.h
index b93a8a5..c05c69c 100644
--- a/include/haproxy/mux_quic-t.h
+++ b/include/haproxy/mux_quic-t.h
@@ -239,6 +239,7 @@
 	int (*init)(struct qcc *qcc);
 	int (*attach_ruqs)(struct qcs *qcs, void *ctx);
 	int (*decode_qcs)(struct qcs *qcs, void *ctx);
+	size_t (*snd_buf)(struct conn_stream *cs, struct buffer *buf, size_t count, int flags);
 	int (*finalize)(void *ctx);
 };
 
diff --git a/include/haproxy/mux_quic.h b/include/haproxy/mux_quic.h
index 332c529..7f3bd3c 100644
--- a/include/haproxy/mux_quic.h
+++ b/include/haproxy/mux_quic.h
@@ -121,7 +121,5 @@
 		return bidi_qcs_new(qcc, id);
 }
 
-size_t qc_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags);
-
 #endif /* USE_QUIC */
 #endif /* _HAPROXY_MUX_QUIC_H */
diff --git a/src/h3.c b/src/h3.c
index 352b8c2..9be2a5b 100644
--- a/src/h3.c
+++ b/src/h3.c
@@ -820,5 +820,6 @@
 	.init        = h3_init,
 	.attach_ruqs = h3_attach_ruqs,
 	.decode_qcs  = h3_decode_qcs,
+	.snd_buf     = h3_snd_buf,
 	.finalize    = h3_finalize,
 };
diff --git a/src/mux_quic.c b/src/mux_quic.c
index 4903352..d870a68 100644
--- a/src/mux_quic.c
+++ b/src/mux_quic.c
@@ -1852,6 +1852,12 @@
 	return 0;
 }
 
+static size_t qc_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
+{
+	struct qcs *qcs = cs->ctx;
+	return qcs->qcc->app_ops->snd_buf(cs, buf, count, flags);
+}
+
 /****************************************/
 /* MUX initialization and instantiation */
 /***************************************/
@@ -1860,8 +1866,7 @@
 static const struct mux_ops qc_ops = {
 	.init = qc_init,
 	.wake = qc_wake,
-	//.snd_buf = qc_snd_buf,
-	.snd_buf = h3_snd_buf,
+	.snd_buf = qc_snd_buf,
 	.rcv_buf = qc_rcv_buf,
 	.subscribe = qc_subscribe,
 	.unsubscribe = qc_unsubscribe,