fix: make check-bbr (backport #4004)

[mergify]

Overview

very minor fix that fixes the check-bbr command

---

This is an automatic backport of pull request #4004 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of c410d88 has failed:

On branch mergify/bp/v2.x/pr-4004
Your branch is up to date with 'origin/v2.x'.

You are currently cherry-picking commit c410d880.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   Makefile

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally