|  | @@ -776,9 +776,9 @@ def cloud_to_prod_jobspec(language,
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				|  |  |          '--test_case=%s' % test_case
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				|  |  |      ]
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				|  |  |      if transport_security == 'tls':
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				|  |  | -        transport_security_options += ['--use_tls=true']
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				|  |  | +        transport_security_options = ['--use_tls=true']
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				|  |  |      elif transport_security == 'google_default_credentials' and language == 'c++':
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				|  |  | -        transport_security_options += [
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				|  |  | +        transport_security_options = [
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				|  |  |              '--custom_credentials_type=google_default_credentials'
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				|  |  |          ]
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				|  |  |      else:
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