|  | @@ -662,7 +662,7 @@ argp.add_argument('--prod_servers',
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				|  |  |                          'cloud_to_prod_auth tests against.'))
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				|  |  |  argp.add_argument('-s', '--server',
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				|  |  |                    choices=['all'] + sorted(_SERVERS),
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				|  |  | -                  action='append',
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				|  |  | +                  nargs='+',
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				|  |  |                    help='Run cloud_to_cloud servers in a separate docker ' +
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				|  |  |                         'image. Servers can only be started automatically if ' +
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				|  |  |                         '--use_docker option is enabled.',
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