AMENDMENT No. 1 to CHANGE IN CONTROL AGREEMENT

Exhibit 10.71

AMENDMENT No. 1

to

CHANGE IN CONTROL AGREEMENT

THIS AGREEMENT, made this 19^th day of December, 2012 by and between Leroy M. Ball, Jr. (“Executive”) and Koppers Holdings Inc. (the “Company”).

WHEREAS, the Company and Executive entered into a Change in Control Agreement (the “CIC Agreement”) dated September 1, 2010; and

WHEREAS, the Company and Executive desire to amend the CIC Agreement to clarify its continued compliance with Section 409A of the Internal Revenue Code of 1986, as amended, and the final regulations and other interpretive guidance issued thereunder.

NOW THEREFORE, in consideration of the mutual covenants contained herein, and intending to be legally bound, the parties hereby agree as follows:

“Notwithstanding anything to the contrary herein, including in subsection (d), in the case of payments or benefits under this Agreement that are or may be deferred compensation subject to Internal Revenue Code Section 409A and are subject to an effective release as set forth above, where the period for execution and non-revocation of the release spans more than one calendar year, no such payment or benefit shall be made or provided any earlier than the beginning of the second calendar year. In no event may Executive, directly or indirectly, designate the calendar year of payment.”

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the day and year first above written.