diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 579da94..e66b48b 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -741,6 +741,8 @@
             body = body->next;
         }
 
+        b->flush = 1;
+
     } else {
         u->request_bufs = cl;
     }