Shortcode in Text widget?

Hi,

I might be missing something vital since my PHP-FU is not so strong…

I am trying to show popular posts this month in a text widget. Adding the shortcode to a post or a page does exactly what I want, but in the text widget it only prints the code.

Any pointers?

Regards/
Jonne

http://wordpress.org/extend/plugins/wp-slimstat-shortcodes/