EXHIBIT NO. 99(a) 8

MFS/SUN LIFE SERIES TRUST

CERTIFICATION OF AMENDMENT

TO THE DECLARATION OF TRUST

REDESIGNATION

OF TRUST AND SERIES

Pursuant to Section 9.3 of the Amended and Restated Declaration of Trust dated May 1, 2001, as amended (the “Declaration”), of MFS/Sun Life Series Trust, a business trust organized under the laws of The Commonwealth of Massachusetts (the “Trust”), the undersigned Trustees of the Trust, being a majority of the Trustees of the Trust, hereby amend Section 1.1 of the Declaration to read in its entirety as follows:

“Section 1.1 – Name. The name of the trust hereby is “MFS Variable Insurance Trust II,” the current address of which is 500 Boylston Street, Boston, Massachusetts 02116.”

Pursuant to Section 6.9 of the Declaration, the undersigned Trustees of the Trust, being a majority of the Trustees of the Trust, hereby redesignate an existing series of Shares (as defined in the Declaration) as follows:

1. The series designated as Blended Research Core Equity Series shall be redesignated as MFS Blended Research Core Equity Portfolio.

2. The series designated as Blended Research Growth Series shall be redesignated as MFS Blended Research Growth Portfolio.

3. The series designated as Blended Research Value Series shall be redesignated as MFS Blended Research Value Portfolio.

4. The series designated as Bond Series shall be redesignated as MFS Bond Portfolio.

5. The series designated as Capital Appreciation Series shall be redesignated as MFS Capital Appreciation Portfolio.

6. The series designated as Core Equity Series shall be redesignated as MFS Core Equity Portfolio.

7. The series designated as Emerging Growth Series shall be redesignated as MFS Emerging Growth Portfolio.

8. The series designated as Emerging Market Equity Series shall be redesignated as MFS Emerging Market Equity Portfolio.

9. The series designated as Global Governments Series shall be redesignated as MFS Global Governments Portfolio.

10. The series designated as Global Growth Series shall be redesignated as MFS Global Growth Portfolio.

11. The series designated as Global Total Return Series shall be redesignated as MFS Global Total Return Portfolio.

12. The series designated as Government Securities Series shall be redesignated as MFS Government Securities Portfolio.

13. The series designated as High Yield Series shall be redesignated as MFS High Yield Portfolio.

14. The series designated as International Growth Series shall be redesignated as MFS International Growth Portfolio.

15. The series designated as International Value Series shall be redesignated as MFS International Value Portfolio.

16. The series designated as Massachusetts Investors Growth Stock Series shall be redesignated as MFS Massachusetts Investors Growth Stock Portfolio.

17. The series designated as Mid Cap Growth Series shall be redesignated as MFS Mid Cap Growth Portfolio.

18. The series designated as Mid Cap Value Series shall be redesignated as MFS Mid Cap Value Portfolio.

19. The series designated as Money Market Series shall be redesignated as MFS Money Market Portfolio.

20. The series designated as New Discovery Series shall be redesignated as MFS New Discovery Portfolio.

21. The series designated as Research International Series shall be redesignated as MFS Research International Portfolio.

22. The series designated as Research Series shall be redesignated as MFS Research Portfolio.

23. The series designated as Strategic Income Series shall be redesignated as MFS Strategic Income Portfolio.

24. The series designated as Strategic Value Series shall be redesignated as MFS Strategic Value Portfolio.

25. The series designated as Technology Series shall be redesignated as MFS Technology Portfolio.

26. The series designated as Total Return Series shall be redesignated as MFS Total Return Portfolio.

27. The series designated as Utilities Series shall be redesignated as MFS Utilities Portfolio.

28. The series designated as Value Series shall be redesignated as MFS Value Portfolio.

Pursuant to Section 6.11 of the Declaration, this instrument shall be effective upon the execution by a majority of the Trustees of the Trust.

IN WITNESS WHEREOF, a majority of the Trustees of the Trust have executed this amendment, in one or more counterparts, all constituting a single instrument, as an instrument under seal in The Commonwealth of Massachusetts, as of this 28^th day of December 2007.

J. KERMIT BIRCHFIELD	MARCIA A. KEAN
J. Kermit Birchfield 33 Way Road Gloucester, MA 01930	Marcia A. Kean 103 Waban Avenue Newton MA 02468
ROBERT C. BISHOP	RONALD G. STEINHART
Robert C. Bishop 1199 Madia Street Pasadena, CA 91103	Ronald G. Steinhart 25 Robledo Drive Dallas, TX 75230
FREDERICK H. DULLES	HAVILAND WRIGHT
Frederick H. Dulles 180 East Bay Street Charleston, SC 29401	Haviland Wright 4610 Kapuna Road Kilauea HI 96754
DAVID D. HORN
David D. Horn 257 Lake Street New Vineyard, ME 04956