diff --git a/install-new/upgrade/php/migrate_orders.php b/install-new/upgrade/php/migrate_orders.php
index 132958985..970f6f930 100644
--- a/install-new/upgrade/php/migrate_orders.php
+++ b/install-new/upgrade/php/migrate_orders.php
@@ -186,7 +186,7 @@ function mo_getPriceDisplayMethod($id_group)
 	static $cache;
 
 	if (!isset($cache[$id_group]))
-    $cache[$id_group] = Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
+    $cache[$id_group] = Db::getInstance()->getValue('
 			SELECT `price_display_method`
 			FROM `'._DB_PREFIX_.'group`
 			WHERE `id_group` = '.(int)$id_group);
diff --git a/install-new/upgrade/php/set_product_suppliers.php b/install-new/upgrade/php/set_product_suppliers.php
index f2b6882a7..7a4f60ac8 100644
--- a/install-new/upgrade/php/set_product_suppliers.php
+++ b/install-new/upgrade/php/set_product_suppliers.php
@@ -5,7 +5,7 @@ function set_product_suppliers()
 	FROM `'._DB_PREFIX_.'configuration` WHERE name="PS_CURRENCY_DEFAULT"');
 
 	//Get all products with positive quantity
-	$resource = Db::getInstance(_PS_USE_SQL_SLAVE_)->query('
+	$resource = Db::getInstance()->query('
 		SELECT id_supplier, id_product, supplier_reference, wholesale_price
 		FROM `'._DB_PREFIX_.'product`
 		WHERE `id_supplier` > 0
@@ -26,7 +26,7 @@ function set_product_suppliers()
 		');
 
 		//Try to get product attribues
-		$attributes = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
+		$attributes = Db::getInstance()->executeS('
 			SELECT id_product_attribute, supplier_reference, wholesale_price
 			FROM `'._DB_PREFIX_.'product_attribute`
 			WHERE `id_product` = '.(int)$row['id_product']
diff --git a/install-new/upgrade/php/set_stock_available.php b/install-new/upgrade/php/set_stock_available.php
index 60d16a2e9..8af0abd2b 100644
--- a/install-new/upgrade/php/set_stock_available.php
+++ b/install-new/upgrade/php/set_stock_available.php
@@ -2,7 +2,7 @@
 function set_stock_available()
 {
 	//Get all products with positive quantity
-	$resource = Db::getInstance(_PS_USE_SQL_SLAVE_)->query('
+	$resource = Db::getInstance()->query('
 		SELECT quantity, id_product, out_of_stock
 		FROM `'._DB_PREFIX_.'product`
 		WHERE `active` = 1
@@ -13,7 +13,7 @@ function set_stock_available()
 		$quantity = 0;
 
 		//Try to get product attribues
-		$attributes = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
+		$attributes = Db::getInstance()->executeS('
 			SELECT quantity, id_product_attribute
 			FROM `'._DB_PREFIX_.'product_attribute`
 			WHERE `id_product` = '.(int)$row['id_product']
@@ -48,4 +48,4 @@ function set_stock_available()
 			("'.(int)$row['id_product'].'", "0", "1", "0", "'.(int)$quantity.'", "0", "'.(int)$row['out_of_stock'].'")
 		');
 	}
-}
\ No newline at end of file
+}
diff --git a/install-new/upgrade/php/update_order_canada.php b/install-new/upgrade/php/update_order_canada.php
index 7d5b66efa..eb33821ca 100644
--- a/install-new/upgrade/php/update_order_canada.php
+++ b/install-new/upgrade/php/update_order_canada.php
@@ -66,7 +66,7 @@ function update_order_canada()
 			// 	returns Group::getDefaultPriceDisplayMethod
 			$tax_calculation_method = $order['price_display_method'];
 
-			$products = Db::getInstance(_PS_USE_SQL_SLAVE_)->ExecuteS('
+			$products = Db::getInstance()->ExecuteS('
 				SELECT * FROM `'._DB_PREFIX_.'order_detail` od
 				WHERE od.`id_order` = '.(int)$id_order);
 
diff --git a/install-new/upgrade/php/update_stock_mvt_reason.php b/install-new/upgrade/php/update_stock_mvt_reason.php
index 987eedcbd..146bc6d20 100644
--- a/install-new/upgrade/php/update_stock_mvt_reason.php
+++ b/install-new/upgrade/php/update_stock_mvt_reason.php
@@ -4,7 +4,7 @@ function update_stock_mvt_reason()
 {
 	//Get all stock mvts reasons already presents in the solution (from 1.4.x)
 	//Remove standard movements to keep only custom movement
-	$mvts = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
+	$mvts = Db::getInstance()->executeS('
 		SELECT smr.*
 		FROM `'._DB_PREFIX_.'stock_mvt_reason`
 		WHERE `id` > 5
@@ -12,7 +12,7 @@ function update_stock_mvt_reason()
 
 	//Get all stock mvts reasons language traduction already presents in the solution (from 1.4.x)
 	//Remove standard movements to keep only custom movement
-	$mvts_lang = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
+	$mvts_lang = Db::getInstance()->executeS('
 		SELECT smrl.*
 		FROM `'._DB_PREFIX_.'stock_movement_reason_lang`
 		WHERE `id_stock_mvt_reason` > 5
@@ -105,4 +105,4 @@ function update_stock_mvt_reason()
 			}
 		}
 	}
-}
\ No newline at end of file
+}