PIONEER BOND FUND

               AMENDMENT TO THE AGREEMENT AND DECLARATION OF TRUST

                                       OF

                                PIONEER BOND FUND

     The undersigned, being at least a majority of the Trustees of Pioneer Bond
Fund, a Delaware statutory trust (the "Trust"), do hereby amend the Agreement
and Declaration of Trust, dated January 5, 1999, as amended (the "Declaration"),
as follows, such amendment to be effective on the date hereof:

     Pursuant to Article IX, Section 8 of the Declaration, Trustees hereby
establish one additional class of shares of the Trust, which shall be designated
Investor Class Shares.


     IN WITNESS WHEREOF, the undersigned being all the Trustees of the Trust
have executed this instrument as of this 3rd day of August, 2004.


 /s/ John F. Cogan, Jr                       /s/ Osbert M. Hood
- ------------------------------------         -----------------------------------
 John F. Cogan, Jr                           Osbert M. Hood


 /s/ Mary K. Bush                            /s/ Marguerite A. Piret
- ------------------------------------         -----------------------------------
 Mary K. Bush                                Marguerite A. Piret


 /s/ Richard H. Egdahl, M.D.                 /s/ Stephen K. West
- ------------------------------------         -----------------------------------
 Richard H. Egdahl, M.D.                     Stephen K. West


 /s/ Margaret B.W. Graham                    /s/ John Winthrop
- ------------------------------------         -----------------------------------
 Margaret B.W. Graham                        John Winthrop

                                      The address of each Trustee is:

                                          c/o Pioneer Investment Management, Inc
                                          60 State Street, Boston, Massachusetts
                                          02109