# Windows environment variables in terraform.rc plugin_cache_dir

I’m attempting to set my `plugin_cache_dir` in my `%APPDATA%\terraform.rc` config file as follows, and it fails to correctly evaluate the `%APPDATA%` environment variable.

I’m escaping `\` as `\\`, without this it complains during `terraform init`.

`plugin_cache_dir = "%APPDATA%\\terraform.d\\plugin-cache"`

Result: `%APPDATA%` is evaluated literally, and a new directory is created inside the current working directory where `terraform init` was executed, literally `.terraform\%APPDATA%\terraform.d\plugin-cache`

Is this a known issue? Is there a way I should be specifying a Windows environment variable differently?

Thanks

Hi @JohnDelisle,

In the places where the CLI configuration accepts environment variable substitutions, the expected syntax is either `\$APPDATA` or `\${APPDATA}`. I think the following should work the way you intended:

``````plugin_cache_dir = "\$APPDATA/terraform.d/plugin-cache"
``````

It should accept either slashes or backslashes as the directory separators, and so I generally prefer using slashes to avoid the need for escaping that makes the file harder to read.

1 Like

Thanks Martin, I’ll give that a go.

That did it, thanks!