diff --git a/src/session.c b/src/session.c
index 3f08a6a3d..5229c7fe2 100644
--- a/src/session.c
+++ b/src/session.c
@@ -1521,8 +1521,8 @@ struct task *process_session(struct task *t)
 		if (s->req->cons->state == SI_ST_EST && !s->req->cons->iohandler)
 			s->req->cons->update(s->req->cons);
 
-		s->req->flags &= ~(BF_READ_NULL|BF_READ_PARTIAL|BF_WRITE_NULL|BF_WRITE_PARTIAL);
-		s->rep->flags &= ~(BF_READ_NULL|BF_READ_PARTIAL|BF_WRITE_NULL|BF_WRITE_PARTIAL);
+		s->req->flags &= ~(BF_READ_NULL|BF_READ_PARTIAL|BF_WRITE_NULL|BF_WRITE_PARTIAL|BF_READ_ATTACHED);
+		s->rep->flags &= ~(BF_READ_NULL|BF_READ_PARTIAL|BF_WRITE_NULL|BF_WRITE_PARTIAL|BF_READ_ATTACHED);
 		s->si[0].prev_state = s->si[0].state;
 		s->si[1].prev_state = s->si[1].state;
 		s->si[0].flags &= ~(SI_FL_ERR|SI_FL_EXP);