diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index 82e8bf7..785c8e1 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -217,6 +217,8 @@
 
     ngx_array_t          cleanup;
 
+    size_t               header_size;
+
     char                *discarded_buffer;
     void               **err_ctx;
     int                  err_status;