diff --git a/install-dev/data/db_structure.sql b/install-dev/data/db_structure.sql
index adfd85d90..d742e995a 100644
--- a/install-dev/data/db_structure.sql
+++ b/install-dev/data/db_structure.sql
@@ -1083,8 +1083,8 @@ CREATE TABLE `PREFIX_orders` (
 CREATE TABLE `PREFIX_order_detail_tax` (
   `id_order_detail` int(11) NOT NULL,
   `id_tax` int(11) NOT NULL,
-  `unit_amount` DECIMAL( 10,6 ) NOT NULL default '0.00',
-  `total_amount` DECIMAL( 10, 6 ) NOT NULL default '0.00'
+  `unit_amount` DECIMAL(16, 6) NOT NULL DEFAULT '0.00',
+  `total_amount` DECIMAL(16, 6) NOT NULL DEFAULT '0.00'
 ) ENGINE=ENGINE_TYPE DEFAULT CHARSET=utf8;
 
 CREATE TABLE `PREFIX_order_invoice` (
diff --git a/install-dev/upgrade/sql/1.5.0.1.sql b/install-dev/upgrade/sql/1.5.0.1.sql
index 38ed67ae1..883ce36bd 100644
--- a/install-dev/upgrade/sql/1.5.0.1.sql
+++ b/install-dev/upgrade/sql/1.5.0.1.sql
@@ -516,8 +516,8 @@ UPDATE `PREFIX_hook` SET `name` = 'actionAttributeSave' WHERE `name` = 'afterSav
 UPDATE `PREFIX_hook` SET `name` = 'actionTaxManager' WHERE `name` = 'taxManager';
 
 ALTER TABLE `PREFIX_order_detail_tax` 
-ADD `unit_amount` DECIMAL( 10, 6 ) NOT NULL AFTER `id_tax` ,
-ADD `total_amount` DECIMAL( 10, 6 ) NOT NULL AFTER `unit_amount`;
+ADD `unit_amount` DECIMAL(16, 6) NOT NULL AFTER `id_tax`,
+ADD `total_amount` DECIMAL(16, 6) NOT NULL AFTER `unit_amount`;
 
 
 ALTER TABLE `PREFIX_specific_price` ADD `id_product_attribute` INT UNSIGNED NOT NULL AFTER `id_product`;
diff --git a/install-dev/upgrade/sql/1.5.0.17.sql b/install-dev/upgrade/sql/1.5.0.17.sql
new file mode 100644
index 000000000..cfee2b4ae
--- /dev/null
+++ b/install-dev/upgrade/sql/1.5.0.17.sql
@@ -0,0 +1,4 @@
+SET NAMES 'utf8';
+
+ALTER TABLE `PREFIX_order_detail_tax` CHANGE `unit_amount` `unit_amount` DECIMAL(16, 6) NOT NULL DEFAULT '0.000000';
+ALTER TABLE `PREFIX_order_detail_tax` CHANGE `total_amount` `unit_amount` DECIMAL(16, 6) NOT NULL DEFAULT '0.000000';