Cannot read long filenames in Gpg / Maven

I have some deeply nested directories on Windows 10. I had to use the following setting in git:

git config --system core.longpaths true

I now started having problems with the GPG plugin. I can do a mvn install if I move the project directly to my C: drive.

[INFO] --- maven-gpg-plugin:1.6:sign (sign-artifacts) @ saf.core.runtime ---
gpg: can't open `C:\Users\name\workspace\xxxxx_xxxxx\xxxxxxxxxxx\xxxxxxxxx\xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\xxxxxxxxxxxxxxxxxxxxxxxxx\xxxxxxxxxxxxxxxxxxxxx\xxxxxxxxxxxxxxxxxxxxxxxxxx\xxxxxxxxxxx\target\xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.jar': No error