Fix windows mysterious, uncharted bug #23

Job	Run time
Ubuntu / Release / gcc	20m 48s
macOS / Release / homebrew-clang	6m 36s
Windows / Release / cl	24m 39s
Ubuntu / Debug / gcc	16m 41s
Windows / Release / clang	29m 44s
macOS / Debug / homebrew-clang	5m 58s
Ubuntu / Release / clang	17m 39s
Windows / Release / clang-cl	27m 12s
macOS / Release / system-clang	5m 55s
Ubuntu / Debug / clang	13m 53s
Windows / Debug / cl	20m 8s
macOS / Debug / system-clang	4m 5s
Windows / Debug / clang	21m 19s
Windows / Debug / clang-cl	23m 48s
	3h 58m 25s

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