diff --git a/extras/build_web2py/web2py.win.spec b/extras/build_web2py/web2py.win.spec
index 6dce1ebf..d2d0e182 100644
--- a/extras/build_web2py/web2py.win.spec
+++ b/extras/build_web2py/web2py.win.spec
@@ -7,7 +7,7 @@ a = Analysis(['web2py.py'],
              pathex=['.'],
              binaries=[],
              datas=[],
-             hiddenimports=['site-packages', 'cgi', 'cgitb', 'code', 'concurrent', 'concurrent.futures', 
+             hiddenimports=['site-packages', 'argparse', 'cgi', 'cgitb', 'code', 'concurrent', 'concurrent.futures', 
               'concurrent.futures._base', 'concurrent.futures.process', 'concurrent.futures.thread', 'configparser', 'csv', 'ctypes.wintypes',
               'email.mime', 'email.mime.base', 'email.mime.multipart', 'email.mime.nonmultipart', 'email.mime.text', 'html.parser', 'http.cookies',
               'ipaddress', 'imp', 'json', 'json.decoder', 'json.encoder', 'json.scanner', 'logging.config', 'logging.handlers', 'profile', 'pstats',