civicrm_og_sync isn't adding new GroupContacts as OG members

In civicrm_og_sync_civicrm_post the wrong class is being used to add a GroupContact:

case 'GroupContact':
require_once 'CRM/Bridge/OG/CiviCRM.php';
switch ( $op ) {
case 'create':
case 'edit':
if ( ! _civicrm_og_sync_set_context( 'civicrm' ) )

{ return; }
CRM_Bridge_OG_Drupal::groupContact( $objectID, $objectRef, 'add' );
break;

case 'delete':
if ( ! _civicrm_og_sync_set_context( 'civicrm' ) ) { return; }

CRM_Bridge_OG_Drupal::groupContact( $objectID, $objectRef, 'delete' );
break;

default:
break;
}

As you can see, 'CRM/Bridge/OG/CiviCRM.php' is loaded, but CRM_Bridge_OG_Drupal is used. The correct class to use in both instances here is CRM_Bridge_OG_CiviCRM as it contains the groupContact method which writes memberships to OG. This results in fatal errors when adding GroupContact's in CiviCRM.