diff --git a/views/userpoints_views_handler_filter_category.inc b/views/userpoints_views_handler_filter_category.inc
index 716487c..173e078 100644
--- a/views/userpoints_views_handler_filter_category.inc
+++ b/views/userpoints_views_handler_filter_category.inc
@@ -3,10 +3,15 @@
  * Filter by category
  */
 class userpoints_views_handler_filter_category extends views_handler_filter_in_operator {
+  function construct() {
+    parent::construct();
+    $this->definition['allow empty'] = TRUE;
+  }
+
   function get_value_options() {
     if (!isset($this->value_options)) {
       $this->value_title = t('Category');
       $this->value_options = userpoints_get_categories();
     }
   }
-}
\ No newline at end of file
+}