Prevent superscript/subscript?

I’ve got links in my site that are DOIs, such as:

[doi:10.1007/978-94-017-8542-6_1](http://dx.doi.org/10.1007/978-94-017-8542-6_1)

When Hugo’s markdown conversion happens, this gets converted into this:

<a href="http://dx.doi.org/10.1007/978-94-017-8542-6_1">doi:10.<sup>1007</sup>⁄<sub>978</sub>-94-017-8542-6_1</a>

How do I prevent this?

in config.yaml

blackfriday:
  smartypants: false
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