[clamav-users] YARA: filesize condition

[Axb]

When trying to use filesize conidtion in a Yara sig
rule FileSize_200KB
{
    condition:
       filesize < 200KB
}

I get

LibClamAV Warning: load_oneyara: yara rule contains no supported 
strings, skipping YARA.FileSizeExample

Am I missing something or if indeed not supported, could it please be 
added? Would help to "failsafe" rules

Thanks

Axb
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