diff --git a/install-dev/php/update_tax_rules.php b/install-dev/php/update_tax_rules.php
deleted file mode 100644
index 252c4dd60..000000000
--- a/install-dev/php/update_tax_rules.php
+++ /dev/null
@@ -1,48 +0,0 @@
-<?php
-
-
-function update_tax_rules()
-{
-	// Add new columns
-	Db::getInstance()->Execute('
-	ALTER TABLE `'._DB_PREFIX_.'tax_rule`
-		ADD `zipcode_from` INT NOT NULL AFTER `id_state` ,
-		ADD `zipcode_to` INT NOT NULL AFTER `zipcode_from` ,
-		ADD `behavior` INT NOT NULL AFTER `zipcode_to`,
-		ADD `description` VARCHAR( 100 ) NOT NULL AFTER `id_tax`;
-	');
-
-	// Drop integrity constraint
-	Db::getInstance()->Execute('
-	ALTER TABLE `'._DB_PREFIX_.'tax_rule` DROP INDEX tax_rule
-	');
-
-	// Create new format rules
-	Db::getInstance()->Execute('
-	INSERT INTO `'._DB_PREFIX_.'tax_rule` (`id_tax_rules_group`, `id_country`, `id_state`, `id_tax`, `behavior`, `zipcode_from`, `zipcode_to`)
-	SELECT r.`id_tax_rules_group`, r.`id_country`, r.`id_state`, r.`id_tax`, 0, z.`from_zip_code`, z.`to_zip_code`
-	FROM `'._DB_PREFIX_.'tax_rule` r INNER JOIN `'._DB_PREFIX_.'county_zip_code` z ON (z.`id_county` = r.`id_county`)
-	');
-
-	// update behavior
-	Db::getInstance()->Execute('
-	UPDATE `'._DB_PREFIX_.'tax_rule` SET `behavior` = GREATEST(`state_behavior`, `county_behavior`);
-	');
-
-
-	// Clean old entries
-	Db::getInstance()->Execute('
-	DELETE FROM `'._DB_PREFIX_.'tax_rule`
-	WHERE `id_county` != 0
-	AND `zipcode_from` = 0
-	');
-
-	// Remove old columns
-	Db::getInstance()->Execute('
-	ALTER TABLE `'._DB_PREFIX_.'tax_rule`
-	  DROP `id_county`,
-	  DROP `state_behavior`,
-	  DROP `county_behavior`
-  ');
-}
-
diff --git a/install-dev/sql/upgrade/1.5.0.1.sql b/install-dev/sql/upgrade/1.5.0.1.sql
index 65a786574..8906205c5 100644
--- a/install-dev/sql/upgrade/1.5.0.1.sql
+++ b/install-dev/sql/upgrade/1.5.0.1.sql
@@ -33,7 +33,28 @@ INSERT INTO `PREFIX_hook` (
 )
 VALUES ('taxmanager', 'taxmanager', NULL , '1', '0');
 
-/* PHP:update_tax_rules(); */;
+ALTER TABLE `PREFIX_tax_rule`
+	ADD `zipcode_from` INT NOT NULL AFTER `id_state` ,
+	ADD `zipcode_to` INT NOT NULL AFTER `zipcode_from` ,
+	ADD `behavior` INT NOT NULL AFTER `zipcode_to`,
+	ADD `description` VARCHAR( 100 ) NOT NULL AFTER `id_tax`;
+
+ALTER TABLE `PREFIX_tax_rule` DROP INDEX tax_rule;
+
+INSERT INTO `PREFIX_tax_rule` (`id_tax_rules_group`, `id_country`, `id_state`, `id_tax`, `behavior`, `zipcode_from`, `zipcode_to`)
+	SELECT r.`id_tax_rules_group`, r.`id_country`, r.`id_state`, r.`id_tax`, 0, z.`from_zip_code`, z.`to_zip_code`
+	FROM `PREFIX_tax_rule` r INNER JOIN `PREFIX_county_zip_code` z ON (z.`id_county` = r.`id_county`);
+
+UPDATE `PREFIX_tax_rule` SET `behavior` = GREATEST(`state_behavior`, `county_behavior`);
+
+DELETE FROM `PREFIX_tax_rule`
+WHERE `id_county` != 0
+AND `zipcode_from` = 0;
+
+ALTER TABLE `PREFIX_tax_rule`
+  DROP `id_county`,
+  DROP `state_behavior`,
+  DROP `county_behavior`;
 
 /* PHP:remove_tab(AdminCounty); */;
 DROP TABLE `PREFIX_county_zip_code`;
diff --git a/install-dev/xml/doUpgrade.php b/install-dev/xml/doUpgrade.php
index 812501710..6e2758fa3 100644
--- a/install-dev/xml/doUpgrade.php
+++ b/install-dev/xml/doUpgrade.php
@@ -133,8 +133,6 @@ require_once(_PS_INSTALLER_PHP_UPGRADE_DIR_.'create_multistore.php');
 
 require_once(_PS_INSTALLER_PHP_UPGRADE_DIR_.'add_order_state.php');
 
-require_once(_PS_INSTALLER_PHP_UPGRADE_DIR_.'update_tax_rules.php');
-
 require_once(_PS_INSTALLER_PHP_UPGRADE_DIR_.'remove_tab.php');
 
 //old version detection