Filed pursuant to Rule 424(b)(3)

File No. 333-178823

UNITED STATES GASOLINE FUND, LP

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Supplement dated July 30, 2012

to

Prospectus dated May 14, 2012

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This supplement contains information, which amends, supplements or modifies certain information contained in the Prospectus of United States Gasoline Fund, LP (“UGA”) dated May 14, 2012. Please read it and keep it with your Prospectus for future reference.

Effective August 1, 2012, the prospectus is amended to reflect the new address for UGA and its general partner, United States Commodity Funds LLC (“USCF”). The new address for the principal office and books and records for UGA and USCF is:

1999 Harrison Street, Suite 1530

Oakland, California 94612

The telephone number for UGA and USCF remains 510.522.9600.

All references in the prospectus are updated accordingly effective August 1, 2012.