diff --git a/src/hlua.c b/src/hlua.c
index 570c9b4..aa6f995 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -1908,6 +1908,7 @@
 	 */
 	channel_init(&socket->s->req);
 	channel_init(&socket->s->res);
+	socket->s->res.flags |= CF_ISRESP;
 
 	socket->s->req.prod = &socket->s->si[0];
 	socket->s->req.cons = &socket->s->si[1];
diff --git a/src/peers.c b/src/peers.c
index 805b8d0..708c019 100644
--- a/src/peers.c
+++ b/src/peers.c
@@ -1256,6 +1256,8 @@
 	s->req.wto = s->be->timeout.server;
 
 	channel_init(&s->res);
+	s->res.flags |= CF_ISRESP;
+
 	s->res.prod = &s->si[1];
 	s->res.cons = &s->si[0];
 
diff --git a/src/session.c b/src/session.c
index a924e8c..4825cb3 100644
--- a/src/session.c
+++ b/src/session.c
@@ -502,6 +502,8 @@
 	s->req.analyse_exp = TICK_ETERNITY;
 
 	channel_init(&s->res);
+	s->res.flags |= CF_ISRESP;
+
 	s->res.prod = &s->si[1];
 	s->res.cons = &s->si[0];
 	s->res.analysers = 0;