MySQL, polish characters and duplicate insert statement.

Question

Hi. I've got a problem with inserting two rows to table. The database is in UTF8. The problem seems to be connected to the collation. This statement works:

insert into test(code,text) values('xx','aaa');

However when i try to add other row to the table:

insert into test(code,text) values('xx','aąą');

it fails with duplicate entry error. It looks like a and ą (special polish character) are threated the same. The weird thing is that when i set all collations to utf8_unicode_ci it still does not work :/ Any help will be appreciated :)