diff --git a/nodequeue_reference.module b/nodequeue_reference.module
index 275a4c6..d71b466 100644
--- a/nodequeue_reference.module
+++ b/nodequeue_reference.module
@@ -107,6 +107,7 @@ function nodequeue_reference_field_info() {
       'default_formatter' => 'nodequeue_reference_formatter',
       'settings' => array(
       ),
+      'property_type' => 'integer'
     ),
   );
 }