No, you don't have to but you can so you can take your loss for of up to $3,000 ($1,500 if MFS) for last year. Just remember to make sure you adjust your carryover balance this year to include the capital loss that you take in your amendment.
Refer to the TurboTax article What is a capital loss carryover?, How do I enter my capital loss carryover?, and Capital Gains and Losses.
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