LispWorks problem

Hi,

I'm trying to allocate an array of unsigned bytes. I have:

(uffi:allocate-foreign-object :unsigned-char buffer-len)

In LispWorks this expands to:

(fli:allocate-foreign-object :type (:unsigned :char) :nelems buffer-len)

Which gives an error that the function :unsigned is not defined. It 
needs to expand to '(:unsigned :char).

Best,

John DeSoi, Ph.D.