Time Machine wants to do complete backup after restore

I had to restore my system from a Time Machine backup because of a recurring problem. Now Time machine wants to backup my entire drive as if I'm actually starting over. I've got 300GB left on my backup drive and this complete backup will use 133GB of it. I have had to do this in the past but I don't remember that Time Machine wanted to do a complete backup before. Is there something I can do to prevent it?

Thanks,
Frank