fixes #2651

Job	Run time
x86_64-gnu-test-preview_mt	5m 40s
check_format	1m 34s
x86_64-musl-test	37m 5s
x86_64-gnu-test (1.7.3)	35m 37s
x86_64-gnu-test (1.8.2)	37m 49s
x86_64-gnu-test (1.9.2)	34m 17s
x86_64-gnu-test (1.10.1)	35m 25s
x86_64-gnu-test (1.11.2)	36m 1s
x86_64-gnu-test (1.12.2)	37m 14s
x86_64-gnu-test (1.13.3)	33m 29s
x86_64-gnu-test (1.14.0)	34m 59s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 50s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	34m 16s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	35m 22s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 35s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 20s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	35m 47s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 13s
	9h 30m 33s

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