Forgot taxable interest but still poor, amend or not?

While doing my 2009 taxed, I discovered that I had made a mistake while filing my 2008 form. I forgot to declare about $100 in taxable interest from a matured CD. However, even with this interest added, my total income falls below the amount needed to receive a full refund meaning that amending would not change the refund or create debt to the IRS. Should I still file a 1040X form? Will leaving it unchanged increase my chance of an audit. I must avoid an audit at all cost.