Exhibit (g)(23)

                         CUSTODIAN AGREEMENT SUPPLEMENT


         (Bear Stearns CUFS MLP Mortgage Portfolio of The RBB Fund, Inc.)

         This supplemental agreement is entered into this 17th day of October,
2006 by and between THE RBB FUND, INC. (the "Fund") and PFPC Trust Company
("PFPC Trust").

         The Fund is a corporation organized under the laws of the State of
Maryland and is an open-end management investment company. The Fund and PFPC
Trust have entered into a Custodian Agreement, dated as of August 16, 1988 (as
from time to time amended and supplemented, the "Custodian Agreement"), pursuant
to which PFPC Trust has undertaken to act as custodian for the Fund with respect
to the portfolios of the Fund, as more fully set forth therein. Certain
capitalized terms used without definition in this Custodian Agreement Supplement
have the meaning specified in the Custodian Agreement.

         The Fund agrees with the Custodian as follows:

         1.       ADOPTION OF CUSTODIAN AGREEMENT. The Custodian Agreement is
                  hereby adopted for Bear Stearns CUFS MLP Mortgage Portfolio
                  (the "Portfolio").

         2.       COMPENSATION. As compensation for the services rendered by the
                  Custodian during the term of the Custodian Agreement, the Fund
                  will pay to the Custodian, with respect to the Portfolio,
                  monthly fees as shall be agreed to from time to time by the
                  Fund and PFPC Trust.

         3.       COUNTERPARTS. This Supplement may be executed in two or more
                  counterparts, each of which shall be deemed an original, but
                  all of which together shall constitute one and the same
                  instrument.

         IN WITNESS WHEREOF, the undersigned have entered into this Supplement,
intending to be legally abound hereby, as of the date and year first above
written.


        THE RBB FUND, INC.                           PFPC TRUST COMPANY

         By:         /s/ Edward J. Roach     By:       /s/ Edward A. Smith  III
                     -------------------               ------------------------

         Name:       Edward J. Roach         Name:     Edward A. Smith, III

         Title:      President               Title:    Vice President