diff --git includes/amazon.views.inc includes/amazon.views.inc
index 8b427a0..ed81998 100644
--- includes/amazon.views.inc
+++ includes/amazon.views.inc
@@ -130,7 +130,7 @@ function amazon_views_data() {
 
   _amazon_make_simple_date_field($data, 'amazon_item', 'releasedate', 'Release date', 'The release date of the product.');
   _amazon_make_simple_text_field($data, 'amazon_item', 'listpriceformattedprice', 'List price', 'The current list price of the item. (Unformatted)');
-  _amazon_make_simple_text_field($data, 'amazon_item', 'invalid_asin', 'Invalid ASIN', 'If nonzero, the ASIN is invalid or discontinued by Amazon');
+  _amazon_make_simple_boolean_field($data, 'amazon_item', 'invalid_asin', 'Invalid ASIN', 'If nonzero, the ASIN is invalid or discontinued by Amazon');
   unset($data['amazon_item']['listpriceformattedprice']['argument']);
 
   // Define the base group of this table. Fields that don't
@@ -195,6 +195,21 @@ function amazon_views_data() {
   return $data;
 }
 
+function _amazon_make_simple_boolean_field(&$data, $table, $column, $title, $help = '') {
+  $data[$table][$column] = array(
+    'title' => t($title), // The item it appears as on the UI,
+    'help' => t($help), // The help that appears on the UI,
+     // Information for displaying a title as a field
+    'field' => array(
+      'field' => $column, // the real field
+      'handler' => 'views_handler_field_boolean',
+      'click sortable' => TRUE,
+     ),
+    'argument' => array('handler' => 'views_handler_argument_numeric'),
+    'filter' => array('handler' => 'views_handler_filter_boolean_operator'),
+    'sort' => array('handler' => 'views_handler_sort'),
+  );
+}
 
 function _amazon_make_simple_text_field(&$data, $table, $column, $title, $help = '') {
   $data[$table][$column] = array(