a new compiler error

While I am currently trying to get KDE on Windows up to a releasable state again (nearly done ;-)), I found an interesting compiler error with the new Visual Studio version (2010):

...
class Andere;

class Klasse {
    public:
        Klasse() : bc(NULL, NULL){
        }
    private:
        std::pair<Andere*, Andere*> bc;
};
...

Why could the above fail? Right, because NULL is not of type class Andere. (That works on the other compilers we have...)