Fix warning reported on macs.

[MFraters]

No description provided.

[codecov]

Codecov Report

Merging #503 (894e046) into main (04161ab) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 894e046 differs from pull request most recent head 32bb6aa. Consider uploading reports for the commit 32bb6aa to get more accurate results

@@            Coverage Diff             @@
##             main     #503      +/-   ##
==========================================
- Coverage   93.44%   93.43%   -0.01%     
==========================================
  Files          91       91              
  Lines        6299     6293       -6     
==========================================
- Hits         5886     5880       -6     
  Misses        413      413              

Impacted Files	Coverage Δ
source/world_builder/objects/bezier_curve.cc	100.00% <ø> (ø)
source/world_builder/utilities.cc	97.03% <ø> (-0.01%)	⬇️
source/world_builder/world.cc	100.00% <ø> (ø)

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.256 ± 0.002 (s=339)	1.257 ± 0.003 (s=380)	+0.0% .. +0.1%
Slab interpolation curved simple none	1.265 ± 0.005 (s=365)	1.265 ± 0.003 (s=349)	-0.0% .. +0.1%
Spherical slab interpolation simple none	1.499 ± 0.004 (s=306)	1.499 ± 0.004 (s=297)	-0.1% .. +0.0%
Slab interpolation simple curved CMS	1.371 ± 0.004 (s=326)	1.370 ± 0.006 (s=333)	-0.2% .. +0.0%
Spherical slab interpolation simple CMS	2.341 ± 0.004 (s=207)	2.338 ± 0.004 (s=180)	-0.2% .. -0.1%
Spherical fault interpolation simple none	1.813 ± 0.006 (s=244)	1.811 ± 0.006 (s=255)	-0.2% .. +0.0%
Cartesian min max surface	3.501 ± 0.029 (s=124)	3.494 ± 0.016 (s=136)	-0.5% .. +0.1%
Spherical min max surface	9.163 ± 0.018 (s=46)	9.170 ± 0.019 (s=55)	-0.1% .. +0.2%

[MFraters]

fixes #502 which was reported by @tjhei