fix a bug spotted by CI #472

Job	Run time
Build windows cp37 wheel for x64	5m 2s
Build windows cp38 wheel for x64	5m 31s
Build linux cp37 wheel on manylinux2014_x86_64	3m 24s
Build windows cp39 wheel for x64	5m 43s
Build darwin cp37 wheel on x86_64	4m 39s
Build linux cp38 wheel on manylinux2014_x86_64	3m 11s
Build macos-14 cp38 wheel with cibuildwheel	5m 33s
Build darwin cp38 wheel on x86_64	4m 23s
Build windows cp310 wheel for x64	6m 45s
Build macos-14 cp39 wheel with cibuildwheel	2m 6s
Build linux cp39 wheel on manylinux2014_x86_64	3m 19s
Build windows cp311 wheel for x64	5m 29s
Build darwin cp39 wheel on x86_64	4m 10s
Build windows cp312 wheel for x64	9m 3s
Build linux cp310 wheel on manylinux2014_x86_64	3m 25s
Build windows-2019 cp39 wheel with cibuildwheel	6m 16s
Build darwin cp310 wheel on x86_64	3m 47s
Build windows-2019 cp310 wheel with cibuildwheel	6m 16s
Build linux cp311 wheel on manylinux2014_x86_64	3m 23s
Build darwin cp310 wheel on arm64	2m 45s
Build windows-2019 cp311 wheel with cibuildwheel	5m 0s
Build darwin cp311 wheel on x86_64	5m 47s
Build linux cp312 wheel on manylinux2014_x86_64	3m 28s
Build windows-2019 cp312 wheel with cibuildwheel	4m 54s
Build darwin cp311 wheel on arm64	2m 29s
Build darwin cp312 wheel on x86_64	5m 11s
Build darwin cp312 wheel on arm64	2m 53s
Package wheels	7s
	2h 3m 59s

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