diff --git a/sql/000_base_structure.sql b/sql/000_base_structure.sql
index 9ab29f71..35a47631 100644
--- a/sql/000_base_structure.sql
+++ b/sql/000_base_structure.sql
@@ -182,9 +182,9 @@ CREATE TABLE IF NOT EXISTS `statistics_shares` (
   `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
   `account_id` int(10) unsigned NOT NULL,
   `block_id` int(10) unsigned NOT NULL,
-  `valid` bigint(20) NOT NULL,
+  `valid` bigint(20) NOT NULL DEFAULT '0',
   `invalid` bigint(20) NOT NULL DEFAULT '0',
-  `pplns_valid` bigint(20) NOT NULL,
+  `pplns_valid` bigint(20) NOT NULL DEFAULT '0',
   `pplns_invalid` bigint(20) NOT NULL DEFAULT '0',
   PRIMARY KEY (`id`),
   KEY `account_id` (`account_id`),