Updating with null terminated stings in Pro*C

Whenever I try to do an update or insert on a fixed length character column with a null terminated string I get the errror: "column too long". How do I overcome this problem?

Dex
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Dexter P. Bradshaw                   \ Internet: dpbradsh_at_bluebox.uwaterloo.ca
Phone (Home): (519) 884-1855         \ Office: DC2306B, University of Waterloo
       (Off): (519) 885-1211 (x4783) \   Post: 200 University Av W.,
Fax         : (519) 885-1208         \         Waterloo, Ont N2L 3G1


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