[tor-relays] obfs3 not recognised by tor 0.2.5.7-rc ?

I'm running tor 0.2.5.7-rc and obfsproxy 0.2.6, and everything seems to work perfectly with these PT lines in torrc: ServerTransportPlugin obfs2 exec /usr/bin/obfsproxy managed ExtORPort auto However, if I try to use obfs3 as well: ServerTransportPlugin obfs2, obfs3 exec /usr/bin/obfsproxy managed then on tor start I get: [warn] Strange ServerTransportPlugin type 'obfs3' [warn] Failed to parse/validate config: Invalid server transport line. I thought my versions would be recent enough to handle obfs3? Is this a bug, or am I missing something obvious? Nick Sheppard