Optional sidebar

So my site uses the primary sidebar on every page, but I want another sidebar on my blogpage (Optional sidebar one). On the blogpage I have: Layout options: Primary sidebar, content Select sidebar: Optional sidebar one But this is not working, as the primary sidebar shows up on the blog page as well, not the optional sidebar one. http://bjornmansson.fi.www17.zoner-asiakas.fi/ I have a child theme.