openXReports broken on OpenX v.2.8.5

If you get this error generating Campaign Delivery Report on OpenX:

 Fatal error: Class 'DataObjects_Campaigns' not found in /var/www/openx/plugins/reports/oxReportsStandard/liveCampaignDeliveryReport.class.php on line 251  

You can repair it adding the red line below on OPENX_PATH/plugins/reports/oxReportsStandard/liveCampaignDeliveryReport.class.php:

 .  
 .  
 .  
 require_once LIB_PATH . '/Extension/reports/ReportsScope.php';  
 require_once MAX_PATH . '/lib/OA/Dll.php';  
 require_once MAX_PATH . '/lib/max/Dal/DataObjects/Campaigns.php';  
 /**  
  * A plugin to generate a report showing conversion tracking information,  
  * for the supplied date range. The report contains a single worksheet:  
  *  
 .  
 .  
 .