[xwiki-users] duplicate ldap entries

Hello, So I have LDAP authentication working now because of the awesome documentation provided. I have noticed a small problem however. When a user logs in with their active directory logon information for example, it will create the Xwiki user account, firstname.lastname, which is fine. However if they enter Firstname.lastname the second time they logon (notice the capital letter), it will create another entry which is a duplicate because of the capital letter. It seems as though the logon username box is case sensitive, is there a way to prevent this? Thanks!