Yunohost CLI fails because can't write to log

gistfile1.txt

admin@raspberrypi:~$ yunohost -h
Traceback (most recent call last):
  File "/usr/bin/yunohost", line 142, in <module>
    _init_moulinette()
  File "/usr/bin/yunohost", line 124, in _init_moulinette
    init(logging_config=logging, _from_source=IN_DEVEL)
  File "/usr/lib/python2.7/dist-packages/moulinette/__init__.py", line 59, in init
    configure_logging(logging_config)
  File "/usr/lib/python2.7/dist-packages/moulinette/utils/log.py", line 42, in configure_logging
    dictConfig(logging_config)
  File "/usr/lib/python2.7/logging/config.py", line 777, in dictConfig
    dictConfigClass(config).configure()
  File "/usr/lib/python2.7/logging/config.py", line 575, in configure
    '%r: %s' % (name, e))
ValueError: Unable to configure handler 'file': [Errno 13] Permission denied: '/var/log/yunohost/yunohost-cli.log'
admin@raspberrypi:~$ sudo ls -l /var/log/yunohost/
total 26
-rw-r--r-- 1 root root 16980 Oct 18 07:10 yunohost-api.log
-rw-r--r-- 1 root root  6558 Oct 18 07:10 yunohost-cli.log
admin@raspberrypi:~$