diff --git a/class.databaserecord.php b/class.databaserecord.php
index 5647342..a5fc7af 100644
--- a/class.databaserecord.php
+++ b/class.databaserecord.php
@@ -40,7 +40,7 @@ abstract class CPHPDatabaseRecordClass extends CPHPBaseClass
 		$this->ConstructDataset($this->sId);
 	}
 	
-	public function ConstructDataset($uDataSource, $defaultable)
+	public function ConstructDataset($uDataSource, $defaultable = null)
 	{
 		$bind_datasets = true;