<PAGE>
Exhibit 3.1(a)
STATE OF DELAWARE
SECRETARY OF STATE
DIVISION OF CORPORATIONS
FILED 09:00 AM 04/14/2000
001192939 - 2607773
STATE OF DELAWARE
CERTIFICATE OF AMENDMENT OF
CERTIFICATE OF INCORPORATION
First: That a meeting of the Board of Directors of Norwest Asset Securities
Corporation resolution was duly adopted setting forth a proposed amendment of
the Certificate of Incorporation of said corporation, declaring said amendment
to be advisable and calling a meeting of the stockholder of said corporation for
consideration thereof, unless the stockholder waives the notice and meeting
requirements. The resolution setting forth the proposed amendment is as follows:
RESOLVED, that the Certificate of Incorporation of the corporation be amended by
changing the Article thereof numbered "1" so that, as amended, said Article
shall be and read as follows:
"The name of the corporation is Wells Fargo Asset Securities Corporation."
Second: Pursuant to resolution of its Board of Directors, the stockholder
waived the holding of a special meeting and approved the amendment by written
consent.
Third: That said amendment was duly adopted in accordance with provisions of
Section 242 of the General Corporation Law of the State of Delaware.
Fourth: That the capital of said corporation shall not be reduced under or by
reason of said amendment.
Fifth: The effective date of this Amendment is April 17, 2000.
BY: /s/ James M. Strother
--------------------------------------------
James M. Strother, President & Secretary