groovydoc links to a wrong type

When I generate groovydocs for the following class:

import api.Foo
import lib.Foo as FooImpl

class FooAdapter implements Foo {
    FooAdapter(FooImpl foo) {}
}

where some API defines:

package api;
public interface Foo {}

and some library defines:

package lib;
public class Foo {}

then in the documentation the implemented interface "Foo" links to lib/Foo.html instead of api/Foo.html.