PHP Error: Missing argument 2 for event_check_dst()

I'm getting the following errors in the 5.x-2.x-dev version of the events module:

warning: Missing argument 2 for event_check_dst(), called in /home/purserj/jamespurser.com.au/modules/event/event.module on line 831 and defined in /home/purserj/jamespurser.com.au/modules/event/event.module on line 2447.

Line 831 is:
$offset=(event_explode_date(event_check_dst($node)));

While the function declaration is:
function event_check_dst($event, $time)