In order to get the correct basis for the shares you sold, find the W-2 where you were taxed on your discount. Take the discount amount (may be in Box 14) and divide by number of shares vested.
Add that amount to the Exercise Price per share to arrive at the Cost Basis for reporting your 1099-B as a regular stock sale (not employee stock, since you know your Cost Basis). Check the box in TurboTax for 'my cost basis is missing or incorrect' and enter the correct cost basis on the next page.
Otherwise, if you use the Exercise Price as your Cost Basis, you will be over-reporting your gain on the sale.
Here's more info on Employee Stock Purchase Plans.
@cabb2000
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