Wait, is he eligible to be your dependent? If so, he cannot "claim himself" (even if you choose not to claim him). He should mark that he is a dependent on his own return, and then resubmit the efile.
If however, if he truly is independent, come back at the end of March to file a 1040-X amended return. Since that will take several months to process, he'll have to file his own return by mail.
