fix test #1991

Job	Run time
check-submodules	47s
check-docs	2m 12s
check-lockfile-version	8s
linux-compat (al2012-x64)	4m 23s
linux-compiler-compat (clang-3)	4m 47s
macos	4m 33s
linux-compat (al2-x64)	5m 23s
linux-musl-armv7 (alpine-3.16-x64)	26m 28s
linux-compiler-compat (clang-6)	5m 26s
linux-compat (manylinux2014-aarch64)	27m 29s
linux-compiler-compat (clang-8)	5m 40s
linux-compat (manylinux2014-x64)	4m 58s
macos-x64	6m 13s
linux-compiler-compat (clang-9)	6m 33s
linux-compat (fedora-34-x64)	4m 39s
musl-linux (alpine-3.16-x64)	5m 11s
linux-compiler-compat (clang-10)	5m 17s
linux-compat (opensuse-leap)	4m 55s
linux-compiler-compat (clang-11)	7m 3s
linux-compat (rhel8-x64)	5m 24s
windows	7m 47s
linux-compiler-compat (gcc-4.8)	5m 3s
windows-vc14-x86	8m 39s
linux-compat (raspbian-bullseye)	25m 30s
linux-compiler-compat (gcc-5)	4m 57s
linux-compiler-compat (gcc-6)	5m 38s
linux-compiler-compat (gcc-7)	4m 35s
linux-compiler-compat (gcc-8)	4m 41s
	3h 24m 19s

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