[racket] using planet from embedded application

I'm trying to require jaz's mysql package like this:
(require (planet jaz/mysql:1:7))

It works fine if I use it from racket, but if I use it from fluxus, 
which embeds racket, I got the following error:
default-module-name-resolver: the kernel's resolver works only on 
`quote' forms; given: '(lib "planet/resolver.rkt")

Should I use a different require form? Any help would be appreciated.

gabor