avoid asking too much information on google's OpenID

Question

I'm using openID to authenticate a user with google's accounts.

I'm using

openid_url = 'https://www.google.com/accounts/o8/id'

('http://openid.net/schema/namePerson/first','firstname')
('http://openid.net/schema/namePerson/last','lastname')

but when the user is redirected to google's page, it appears:

View basic information about your account

and when I click on the info button, it appears:

View your name, public profile URL, and photo

View your gender and birthdate

View your country, language, and timezone

which is clearly not what I'm asking for.

Why is this happening? How can I avoid losing users because they think I'm Big Brother?