How to apply a patch in Git that contains changes to the file name?

I created a patch that consists of changing the file name:

git mv -f confvars.sh ConfVars.sh
git commit -am 'test filename case change'
git format-patch -M -1 HEAD

but when I try to apply this patch, I get an error message:

git apply 0001-test-filename-case-change.patch
> error: ConfVars.sh: already exists in working directory

How can I apply this patch without causing an error?

** EDIT **

To clarify the above example: when applying the patch, the ConfVars.sh file does not exist, the confvars.sh file exists, which I would expect to rename, instead it displays the above error.