diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index d38d6c0..b6f2161 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -45,6 +45,7 @@
     ngx_uint_t                      status;
     time_t                          response_sec;
     ngx_uint_t                      response_msec;
+    off_t                           response_length;
 
     ngx_str_t                      *peer;
 } ngx_http_upstream_state_t;