nginx+ mod_zip configuration

If mod_zip gets such lines:
- 56320 /form1.doc form1.doc
- 55296 /form2.doc form2.doc
it works fine, but if (subdir added):
- 56320 /upload/form1.doc form1.doc
- 55296 /upload/form2.doc form2.doc
returns error: mod_zip: invalid file list from upstream while sending to client

Please help to fix that issue