Using the ProfileService with custom profile classes.

Hi.
I'm not sure if this is the right place to post, but here it goes.
We've been using the asp.net Profile system for a while now, but now we want to access Profiles, Roles etc. from a WCF service.
We have a problem with the ProfileService, probably because the ProfileService doesn't know our custom profile classes (KnownType).
Here is what we have in web.config for the service:
<profile inherits="MyCompany.Web.Profile.MyAppProfile" defaultProvider="SqlProvider" enabled="true" automaticSaveEnabled="true">
      <providers>
        <clear/>
        <add name="SqlProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="UserRepository" applicationName="MyApp" description="SqlProfile for MyApp"/>
&nb ...