diff --git a/uc_attribute/views/uc_attribute_handler_filter_product_attr.inc b/uc_attribute/views/uc_attribute_handler_filter_product_attr.inc
index f20d9dc..9e80d09 100644
--- a/uc_attribute/views/uc_attribute_handler_filter_product_attr.inc
+++ b/uc_attribute/views/uc_attribute_handler_filter_product_attr.inc
@@ -50,6 +50,7 @@ class uc_attribute_handler_filter_product_attr extends views_handler_filter_in_o
         $condition = db_and();
       }
       else {
+        $not = '';
         $condition = db_or();
       }