Add definition to source file does not work with friend function

Given following class definition:

class Klass
{
    friend int foo(Klass& k);
}

When I right click on foo and activate Refactor/Add definition to klass.cpp, QtCreator wrongfully adds a class scope:

int Klass::foo(Klass& k)
{
}

Correctly it should have generated:

int foo(Klass& k)
{
}