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@ndparker, thanks for your PR! By analyzing the history of the files in this pull request, we identified @benjaminp, @tim-one, @Yhg1s, @mdickinson and @mhammond to be potential reviewers.

Could you please backport this change to 3.6 @ndparker?

FWIW, I've signed the CLA now :-)

@serhiy-storchaka Thanks for merging. Should I open another PR for python 3.6 or how is it supposed to be done?

Thanks @ndparker. Signing the CLA for such trivial change is not needed, but i hope this is not your last contribution.

Just open another PR for Python 3.6.