diff --git a/cms/plugins/hybrid/classes/datasource/hybrid/field/source/document.php b/cms/plugins/hybrid/classes/datasource/hybrid/field/source/document.php
index b3e434132..9af38d9f8 100644
--- a/cms/plugins/hybrid/classes/datasource/hybrid/field/source/document.php
+++ b/cms/plugins/hybrid/classes/datasource/hybrid/field/source/document.php
@@ -11,7 +11,7 @@
 class DataSource_Hybrid_Field_Source_Document extends DataSource_Hybrid_Field_Source_OneToOne {
 
 	protected $_is_searchable = FALSE;
-	
+	protected $default = 0;
 	protected $_props = array(
 		'isreq' => TRUE,
 		'ds_type' => NULL,
@@ -139,4 +139,4 @@ public function get_query_props(\Database_Query $query, DataSource_Hybrid_Agent
 			->on('dss' . $this->id . '.published', '=', DB::expr( 1 ))
 			->select(array('dss'.$this->id.'.header', $this->id . 'header'));
 	}
-}
\ No newline at end of file
+}