set completion-ignore-case on doesn't work in bash

Linux and Unix-Like Ubuntu
1

completion-ignore-case option doesn't work in my version:

/home/user $ echo $BASH_VERSION 
3.2.48(1)-release
/home/user $ ls -l [Ss]*
-rw-r--r-- 1 user user 0 2009-10-18 00:09 somefile
-rw-r--r-- 1 user user 0 2009-10-18 00:09 Somefile
/home/user $ set completion-ignore-case on

But when I write ls s and press TAB bash completes expression to the somefile only:

/home/user $ ls s<TAB>omefile
2 
bind 'set completion-ignore-case on'
3

Great! I forgot bind... By the way, in my isssue the following command works:

bind `echo set completion-ignore-case on`

Thanks a lot