torsocks complains about unknown system call #417 on FreeBSD

Command:

torify telnet {some-onion}.onion {some port}

When it connects, pressing Ctrl-C prints this error:

^C1530319165 WARNING torsocks[69407]: [syscall] Unsupported syscall number 417. Denying the call (in tsocks_syscall() at syscall.c:496)

and telnet doesn't exit.

torsocks-2.2.0 on FreeBSD 11.1