'hrl' is not recognized as an internal or external command

[SegFault0x0]

When attempting to run the command

$ rebar3 as prod relflow -u "first-release"

I get the error,

git error: 'hrl' is not recognized as an internal or external command

I've gotten this error with my own project and when testing it out with the steps provided at http://mijkenator.github.io/2016/04/07/erlang-rebar3-relflow-releases/. I'm running this on Git Bash in Windows 7.

Any ideas?