fix #295

[d-chambers]

Description

This PR fixes #295.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test. See testing guidelines.
• your name has been added to the contributors page (docs/contributors.md).
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ec2c248) 99.30% compared to head (42b69d6) 99.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #311   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files          86       86           
  Lines        6796     6797    +1     
=======================================
+ Hits         6749     6750    +1     
  Misses         47       47           

Flag	Coverage Δ
unittests	99.30% <100.00%> (+<0.01%)	⬆️

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