Exhibit 1.(g)



                           CERTIFICATION OF AMENDMENT
                             TO DECLARATION OF TRUST

         The undersigned, constituting at least a majority of the Trustees of
MERRILL LYNCH MUNICIPAL SERIES TRUST (the "Trust"), a business trust organized
under the laws of Massachusetts, pursuant to the Declaration of Trust of the
Trust dated the 14th day of August, 1986, as amended (the "Declaration"), do
hereby certify that the Trustees of the Trust have duly adopted the following
amendment, as approved by the holders of at least two-thirds of the outstanding
shares of the Trust, to the Declaration:

VOTED:   That Section 3.2 of Article III of the Declaration be, and it hereby
         is amended so that, as amended, it shall read as follows:

         3.2. Investments. The Trustees shall have power, subject to the
     Fundamental Policies, to:

               (a) conduct, operate and carry on the business of an investment
          company;

               (b) subscribe for, invest in, reinvest in, purchase or otherwise
          acquire, hold, pledge, sell, assign, transfer, exchange, distribute or
          otherwise deal in or dispose of negotiable or non-negotiable
          instruments, obligations, evidences of indebtedness, certificates of
          deposit or indebtedness, commercial paper, repurchase agreements,
          reverse repurchase agreements, options, futures contracts, options on
          futures contracts and other investments, including, without
          limitation, those issued, guaranteed or sponsored by any state,
          territory or possession of the United States and the District of
          Columbia and their political subdivisions, agencies and
          instrumentalities, or by the United States Government or its agencies
          or instrumentalities, or international instrumentalities, or by any
          bank, savings institution, corporation or other business entity
          organized under the laws of the United States and, to the extent
          provided in the Prospectus and not prohibited by the Fundamental
          Policies, organized under foreign laws; and to exercise any and all
          rights, powers and privileges of ownership or interest in respect of
          any and all such investments of every kind and description, including,
          without limitation, the right to consent and otherwise act with
          respect thereto, with power to designate one or more persons, firms,
          associations or corporations to exercise any of said rights, powers
          and privileges in respect of any of said instruments; and the Trustees
          shall be deemed to have the foregoing powers with respect to any
          additional securities in which any series of the Trust may invest
          should the investment policies set forth in the Prospectus or the
          Fundamental Policies be amended.

               (c) The Trustees shall not be limited to investing in obligations
          maturing before the possible termination of the Trust, nor shall the
          Trustees be limited by any law limiting the investments which may be
          made by fiduciaries.





                                      -2-


               (d) Notwithstanding any other provision of this Declaration to
          the contrary, the Trustees shall have the power in their discretion
          without any requirement of approval by Shareholders to either invest
          all or a portion of the Trust Property in, sell all or a portion of
          the Trust Property and invest the proceeds of such sales in, or
          transfer all or a portion of the Trust Property to one or more
          investment companies to the extent not prohibited by the 1940 Act and
          any exemptive orders granted under the 1940 Act.

         IN WITNESS WHEREOF, the undersigned have executed this Amendment this
day of                          , 2000.



-----------------------------               ------------------------------
Ronald W. Forbes                            Roscoe S. Suddarth
1400 Washington Avenue                      1761 N Street, NW
Albany, NY 12222                            Washington, D.C. 20036-1141



-----------------------------               ------------------------------
Terry K. Glenn                              Richard R. West
800 Scudders Mill Road                      Box 604
Plainsboro, NJ 08536                        Genoa, NV 89411



-----------------------------               ------------------------------
Cynthia A. Montgomery                       Arthur Zeikel
Harvard Business School                     300 Woodland Avenue
Soldiers Field Road                         Westfield, NJ 07090
Morgan Hall, Room 219
Boston, MA 02163



-----------------------------               ------------------------------
Charles C. Reilly                           Edward D. Zinbarg
9 Hampton Harbor Road                       5 Hardwell Road
Hampton Bays, NY 11946                      Short Hills, NJ 07078-2117



-----------------------------
Kevin A. Ryan
127 Commonwealth Avenue
Chestnut Hill, MA 02467



         The Declaration, a copy of which is on file in the office of the
Secretary of the Commonwealth of Massachusetts, provides that the name "MERRILL
LYNCH MUNICIPAL SERIES TRUST" refers to the Trustees under the Declaration
collectively as trustees, but not as individuals or personally; and no Trustee,
shareholder, officer, employee or agent of the Trust shall be held to any
personal liability, nor shall resort be had to their private property for the
satisfaction of any obligation or claim or otherwise in connection with the
affairs of the Trust but the Trust Property only shall be liable.