diff --git a/src/checks.c b/src/checks.c
index af6ddd4..b965ee6 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -850,7 +850,7 @@
 
 	done = 0;
 
-	conn->mux->rcv_buf(cs, &check->bi, b_size(&check->bi), 0);
+	cs_recv(cs, &check->bi, b_size(&check->bi), 0);
 	if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH) || cs->flags & CS_FL_ERROR) {
 		done = 1;
 		if ((conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) && !b_data(&check->bi)) {
@@ -2918,7 +2918,7 @@
 				goto out_end_tcpcheck;
 
 			__cs_want_recv(cs);
-			if (conn->mux->rcv_buf(cs, &check->bi, b_size(&check->bi), 0) <= 0) {
+			if (cs_recv(cs, &check->bi, b_size(&check->bi), 0) <= 0) {
 				if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH) || cs->flags & CS_FL_ERROR) {
 					done = 1;
 					if ((conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) && !b_data(&check->bi)) {
diff --git a/src/connection.c b/src/connection.c
index e021290..4b1e066 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -384,6 +384,33 @@
 }
 
 /*
+ * default conn_stream recv() : this one is used when cs->rcv_buf == NULL.
+ * It reads up to <count> bytes from cs->rxbuf, puts them into <buf> and
+ * returns the count. It possibly sets/clears CS_FL_RCV_MORE depending on the
+ * buffer's state, and may set CS_FL_EOS. The number of bytes transferred is
+ * returned. <buf> is not touched if <count> is null, but cs flags will be
+ * updated to indicate any RCV_MORE or EOS.
+ */
+size_t __cs_recv(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
+{
+	size_t ret = 0;
+
+	/* transfer possibly pending data to the upper layer */
+	ret = b_xfer(buf, &cs->rxbuf, count);
+
+	if (b_data(&cs->rxbuf))
+		cs->flags |= CS_FL_RCV_MORE;
+	else {
+		cs->flags &= ~CS_FL_RCV_MORE;
+		if (cs->flags & CS_FL_REOS)
+			cs->flags |= CS_FL_EOS;
+		cs_drop_rxbuf(cs);
+	}
+
+	return ret;
+}
+
+/*
  * Get data length from tlv
  */
 static int get_tlv_length(const struct tlv *src)
diff --git a/src/stream_interface.c b/src/stream_interface.c
index f1b52c1..a0c73bc 100644
--- a/src/stream_interface.c
+++ b/src/stream_interface.c
@@ -1236,7 +1236,7 @@
 			break;
 		}
 
-		ret = conn->mux->rcv_buf(cs, &ic->buf, max, co_data(ic) ? CO_RFL_BUF_WET : 0);
+		ret = cs_recv(cs, &ic->buf, max, co_data(ic) ? CO_RFL_BUF_WET : 0);
 		if (cs->flags & CS_FL_RCV_MORE)
 			si->flags |= SI_FL_WAIT_ROOM;