Mineral rights royalities

In previous years, TurboTax would let you decline taking the depletion allowance. This year, you can't -- once you enter the info from 1099-MISC, the depletion is figured and entered. I don't necessarily want the depletion.  Am I wrong -- didn't TurboTax change this from last year?  Plus, my mom is entitled to the same depletion deduction/credit but she uses TT Deluxe and when TT figured her taxes, she didn't get it (no deduction/credit).