OP 2.0 has gmap value vs reference error

With PHP 5.3 the following error occurs:
warning: Parameter 2 to gmap_gmap() expected to be a reference, value given in /path/to/op/includes/module.inc on line 483.

Changing includes/module.inc like 483 to:
$result = call_user_func_array($function, &$args);

fixes this error. Note the addition of the pass-by-reference & on the second parameter.