You'll need to fix it, or it will "waller out" (that's a highly technical term, there!) your head tube, if it hasn't already done so a little bit. You can sometimes set races with red LocTite #271, but I'm not sure about that in this high-impact situation. Best bet would be to take some measurements with a micrometer and see if the head tube is oversized or if the race is undersized. If it is the race, I would replace it. If it is the head tube, be sure to inspect it thoroughly for cracks or other damage. Might even be worth magnafluxing (?) maybe. If the head tube is OK, I would use some shim material to hold the race tight. Be sure to use the same amount on opposite sides of the opening so you don't misalign the steerer, even though it would be minimal.
Good luck.