Muhenkan and Henkan_Mode keys not recognized in config file

[linux36524]

I am using an HHKB keyboard which has Muhenkan and Henkan_Mode keys (located to the left and right of the spacebar). When I try to use these keys as modifiers or bindings in my swhkdrc, swhkd fails to parse the config file and throws a "Config Error: unable to parse config file".

[2026-06-01T14:45:38Z ERROR swhkd] Config Error: unable to parse config file [2026-06-01T14:45:38Z ERROR swhkd] --> /home/xxx/.config/swhkd/swhkdrc:21:8 | 21 | muhenkan | ^--- | = expected command