[O] ca47d10e commit broke the build

[Martyn Jago]

Frankly I'm not sure why, but my build is broken against emacs 22,23,24

Ref: 
http://martynjago.co.uk:3333/builds/Org-mode_on_Emacs_24/ca47d10e1f0070f5c6461ff763486b693ff77209

Best, Martyn