fix #1967

[affeldt-aist]

Motivation for this change

fix #1967

Checklist

• added corresponding entries in CHANGELOG_UNRELEASED.md

• added corresponding documentation in the headers

Reference: How to document

Merge policy

As a rule of thumb:

• PRs with several commits that make sense individually and that
  all compile are preferentially merged into master.
• PRs with disorganized commits are very likely to be squash-rebased.

Reminder to reviewers

• Read this Checklist
• Put a milestone if possible
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[affeldt-aist]

@mkerjean I will maybe merge if the CI is green because these are mostly cosmetic changes in the end, the original issue maybe did make that much sense :-/