Amendment to 2017 Directors' Annual Equity Award Certificate for Restricted Stock Units of Discover Financial Services, effective February 22, 2018

Discover awarded you restricted stock units as an incentive for you to continue to provide services as a Director of the Company from the date of the grant on May 11, 2017 through the Scheduled Vesting Date on May 11, 2018 (“2017 RSU”). Effective February 22, 2018, the 2017 RSU is hereby amended to change the Scheduled Vesting Date to immediately prior to May 2, 2018, the first annual meeting of shareholders following the date of grant.

IN WITNESS WHEREOF, Discover has duly executed and delivered this Amendment to the 2017 RSU as of February 22, 2018.