Cannot unregister the runner in OSX

Hi,

I would like to unregister the runner in OSX.

 # gitlab-ci-multi-runner list
Listing configured runners                          ConfigFile=/Users/iiro/.gitlab-runner/config.toml
Ippes-Air.local                                     Executor=virtualbox Token=4dfbeddb9d836a00a1687657b70e63 URL=http://xx.xx.xx.xx/ci

If I try to unregister I get:

# gitlab-ci-multi-runner unregister Ippes-Air.local
WARNING: Running in user-mode.
WARNING: Use sudo for system-mode:
WARNING: $ sudo gitlab-runner...

ERROR: Deleting runner... error                     status=only http or https scheme supported
FATAL: Failed to delete runner

How can I remove it...?