error setting certificate verify locations

I'm running Gitlab CE with an certificate signed by StartSSL and a multi runner on a windows 10 system.
All builds are failing with error setting certificate verify locations

Full output:

gitlab-ci-multi-runner 1.0.2 (ea19241)
Using Shell executor...
Running on xxx...
Cloning repository...
Cloning into 'D:/Gitlab Runner/builds/d4db4ac7/0/xxx/xxx'...
fatal: unable to access 'https://gitlab-ci-token:xxxxxx@xxx.xxx.xxx/xxx/xxx.git/': error setting certificate verify locations:
  CAfile: D:\Gitlab Runner\D:\Gitlab Runner\builds\d4db4ac7\0\xxx\xxx.tmp\GIT_SSL_CAINFO
  CApath: none
The system cannot find the path specified.
Checking out fe9f705f as master...
fatal: Not a git repository (or any of the parent directories): .git

ERROR: Build failed with: exit status 128

I suspect the issue might be related to this D:\Gitlab Runner\D:\Gitlab Runner\... But the documentation is not really present on how to override/fix that path...