Moving website - admin section

I have successfully moved a wordpress site from /test directory to the root, so now the website url looks like www.example.com. Fine. However the admin section (wp-admin) still points to /test directory and so the url looks like http://ift.tt/1AmSvBC... How can I make it like http://ift.tt/KOWx3o...?

Please notice that I'm not interested in a simple redirection (now the customer is able to access the admin section with http://ift.tt/1oHP0SG, but then he's redirected to http://ift.tt/1AmSvBC..., and it's not what he wants.

Thanks in advance