Attendees Count on Event Listing page includes Not Going and Maybe's

On the event listing page view, the number of attendees incorrectly includes those 'Not Going' and 'Maybe'.... click through to the individual event detail page itself and the number of attendees shown at the top of the page there is correct.

So hopefully just a fairly simple tweak to fix that? (don't need it on my site urgently as not a major issue so I haven't included site details.. can wait until next release!)