diff --git a/Entity/Listener/StatisticsListener.php b/Entity/Listener/StatisticsListener.php
index e25d7c64..a8c8da5f 100644
--- a/Entity/Listener/StatisticsListener.php
+++ b/Entity/Listener/StatisticsListener.php
@@ -16,10 +16,12 @@ public function postGenerateSchema(GenerateSchemaEventArgs $event)
         }
 
         $table = $schema->createTable('jms_job_statistics');
+        $table->addColumn('id', 'bigint', array('nullable' => false, 'unsigned' => true, 'autoincrement' => true));
         $table->addColumn('job_id', 'bigint', array('nullable' => false, 'unsigned' => true));
         $table->addColumn('characteristic', 'string', array('length' => 30, 'nullable' => false));
         $table->addColumn('createdAt', 'datetime', array('nullable' => false));
         $table->addColumn('charValue', 'float', array('nullable' => false));
-        $table->setPrimaryKey(array('job_id', 'characteristic', 'createdAt'));
+        $table->setPrimaryKey(array('id'));
+        $table->addIndex(array('job_id'));
     }
 }
\ No newline at end of file