CALAMOS INVESTMENT TRUST Amendment to Administration Servicing Agreement

Exhibit (h)(34)

CALAMOS INVESTMENT TRUST

Amendment to Administration Servicing Agreement

     This is an amendment (the “Amendment”) to the Administration Servicing Agreement, dated September 21, 2000, by and between Calamos Investment Trust and U.S. Bancorp Fund Services, LLC, (as amended, restated, modified or supplemented from time to time, collectively, the “Agreement”).

     In consideration of the mutual covenants and agreements contained herein, the parties agree to the following amendments to the Agreement:

1. The separate series of Calamos Investment Trust set forth on Exhibit A of the Agreement are hereby replaced with the following:

Name of Series
Calamos Growth Fund
Calamos Blue Chip Fund
Calamos Value Fund
Calamos Growth and Income Fund
Calamos International Growth Fund
Calamos Global Growth and Income Fund
Calamos High Yield Fund
Calamos Convertible Fund
Calamos Market Neutral Income Fund
Calamos Multi-Fund Blend
Calamos Global Equity Fund
Calamos Total Return Bond Fund
Calamos Evolving World Growth Fund
Calamos Discovery Growth Fund

     All other terms of the Agreement shall remain in full force and effect. If the terms of the Agreement and this Amendment conflict, the terms of this Amendment shall govern.

     Each party represents that the undersigned has full power and authority to execute this Amendment and bind such party according to the terms herein.

Dated: December 16, 2009

Calamos Investment Trust
By:		/s/ Xxxxxx Xxxxx
Name: Xxxxxx Xxxxx
Title: Secretary

U.S. Bancorp Fund Services, LLC
By:		/s/ Xxx Xxxxxx
Name:		Xxx Xxxxxx
Title:		Executive Vice President