Pager breaks when HAVING clause references existing table column

Pager breaks when HAVING clause references any existing table column.

Query used:

$q = Doctrine_Query::create()
->select("u.id, u.first_name, u.last_name, u.is_active")
->addSelect('COUNT(u.id) as rolecount')
->from('User u')
->leftJoin('u.Roles r')
->groupBy('u.id')
->having("rolecount > 2 and u.is_active = 1");

Execution of query by itself works fine (eg via execute(), fetch...)

When putting this query in a Doctrine_Pager, error outputs:

$pager = new Doctrine_Pager(
$q,
$currentPage,
$resultsPerPage
);

$pager->execute();

Error Received:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'u.is_active' in 'having clause'