diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 495b1743d..902cfb8f2 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1132,12 +1132,11 @@ ngx_http_proxy_create_request(ngx_http_request_t *r)
             body = body->next;
         }
 
-        b->flush = 1;
-
     } else {
         u->request_bufs = cl;
     }
 
+    b->flush = 1;
     cl->next = NULL;
 
     return NGX_OK;