diff --git a/src/proto_http.c b/src/proto_http.c
index 2c5045c95..6ee9354f6 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -5932,6 +5932,7 @@ int http_process_res_common(struct session *t, struct channel *rep, int an_bit,
 			txn->status = 0;
 			t->logs.t_data = -1; /* was not a response yet */
 			rep->analysers |= AN_RES_WAIT_HTTP | an_bit;
+			rep->flags |= CF_WAKE_WRITE;
 			return 1;
 		}
 		else if (unlikely(txn->status < 200))