diff --git a/src/proxy.c b/src/proxy.c
index 78babd5..f669ebf 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -1470,6 +1470,13 @@
 
 			if (conn && cs) {
 				si_rx_endp_more(&s->si[0]);
+				/* Make sure we're unsubscribed, the the new
+				 * mux will probably want to subscribe to
+				 * the underlying XPRT
+				 */
+				if (s->si[0].wait_event.events)
+					conn->mux->unsubscribe(cs, s->si[0].wait_event.events,
+					    &s->si[0].wait_event);
 				if (conn_upgrade_mux_fe(conn, cs, &s->req.buf, ist(""), PROTO_MODE_HTX)  == -1)
 					return 0;
 				s->flags |= SF_HTX;