pbr gives an error when "--trusted-host" is included in requirements

If "--trusted-host" is used within requirements.txt, PBR gives the following error when running setup.py:

error in setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers; Parse error at "'--truste'": Expected W:(abcd...)
Traceback (most recent call last):
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\timh\AppData\Local\Programs\Python\Python38-32\Scripts\devpi.exe\__main__.py", line 7, in <module>
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\site-packages\devpi\main.py", line 36, in main
    return method(hub, hub.args)
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\site-packages\devpi\upload.py", line 41, in main
    archives.extend(exported.setup_build(
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\site-packages\devpi\upload.py", line 430, in setup_build
    out = self.hub.popen_output(cmd, cwd=self.rootpath)
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\site-packages\devpi\main.py", line 291, in popen_output
    return subprocess.check_output(args, cwd=str(cwd)).decode('utf-8')
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "c:\users\timh\appdata\local\programs\python\python38-32\lib\subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['C:\\git\\software\\antec-production-ats-repo\\venv\\Scripts\\python.EXE', 'setup.py', 'sdist', '--formats', 'zip']' returned non-zero exit status 1.