Pycharm 2017.1 py.test no longer working with -m option

In my unit tests I market some tests with "@pytest.mark.slow" to avoid running them except when explicitly desired.

In the setup for my PyCharm runner I set the Additional Arguments to:

    --color=yes -m "not slow"

This worked fine in PyCharm 2016, but with the new PyCharm 2017 I get the following error:

    ERROR: file not found: slow"

Can you please help. I tried using single quotes in place of double quotes but it did not help. Again this worked fine in all previous versions of PyCharm.