Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned, Michael Gilligan, Principal Financial Officer of DB Commodity Services LLC, the Managing Owner of PowerShares DB US Dollar Index Bearish Fund (the “Fund”), a series of PowerShares DB US Dollar Index Trust, hereby certifies pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

The Fund’s Quarterly Report on Form 10-Q for the period ended June 30, 2009, as filed with the Securities and Exchange Commission on the date hereof (the “Quarterly Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)

The information contained in the Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the Fund.

E-5

/s/ Michael Gilligan

Michael Gilligan

July 31, 2009

Principal Financial Officer

DB US DOLLAR INDEX BEARISH MASTER FUND 10-Q