diff --git a/classes/DataWarehouse/Query/SUPREMM/RawData.php b/classes/DataWarehouse/Query/SUPREMM/RawData.php
index f1852a11..95a26a17 100644
--- a/classes/DataWarehouse/Query/SUPREMM/RawData.php
+++ b/classes/DataWarehouse/Query/SUPREMM/RawData.php
@@ -3,6 +3,7 @@
 
 use \DataWarehouse\Query\Model\Table;
 use \DataWarehouse\Query\Model\TableField;
+use \DataWarehouse\Query\Model\FormulaField;
 use \DataWarehouse\Query\Model\WhereCondition;
 use \DataWarehouse\Query\Model\Schema;
 use \DataWarehouse\Query\Model\OrderBy;
@@ -65,6 +66,7 @@ public function __construct(
         $this->addField(new TableField($factTable, "start_time_ts"));
         $this->addField(new TableField($factTable, "end_time_ts"));
         $this->addField(new TableField($factTable, "cpu_user"));
+        $this->addField(new FormulaField('COALESCE(LEAST(sj.wall_time / sj.requested_wall_time, 1), -1)', 'walltime_accuracy'));
 
         $this->addTable( $joblistTable );
         $this->addTable( $factTable );