Am I still the godmother?

I am the godmother of my nephew, who was baptized in the Lutheran church, I am also Lutheran. He is now converting to Catholicism and will be making his first communion there this weekend (actually, this is his 'second' communion as he already had his first communion in the Lutheran church). Anyhow, since the Catholic church does not recognize non-Catholics as godparents (only witnesses?) will I still be considered his godmother? I am sure that in the scheme of things, this does not really matter, but I am curious abuot this...