XF 1.5 New User Registration

Is there any way to make a mandatory requirement for a new user registration to include both a first name and a last name in order to process a registration? I've looked under "User Registration/Options" and don't see it there. We do have a first name and a last name field in the User Profile/Personal Details page.
Thanks.
 
If they're custom user fields, just mark "Field is required" and save.

Admin Panel -> Users -> User Customization -> Custom User Fields -> Choose -> General options -> Field is required
 
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