Old Second Bancorp (OSBC) 10-K 2004 FY Annual report

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Old Second Bancorp Inc. (the “Company”) on Form 10-K for the period ending December 31, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report), I, J. Douglas Cheatham,Chief Financial Officer, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

                (1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

              (2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ J. Douglas Cheatham

J. Douglas Cheatham

Senior Vice-President and Chief Financial Officer

March 15, 2005

1