diff --git a/controllers/front/OrderOpcController.php b/controllers/front/OrderOpcController.php
index 7bde212a6..d05b50e0a 100644
--- a/controllers/front/OrderOpcController.php
+++ b/controllers/front/OrderOpcController.php
@@ -526,8 +526,8 @@ class OrderOpcControllerCore extends ParentOrderController
 		/* Check minimal amount */
 		$currency = Currency::getCurrency((int)$this->context->cart->id_currency);
 
-		$minimalPurchase = Tools::convertPrice((float)Configuration::get('PS_PURCHASE_MINIMUM'), $currency);
-		if ($this->context->cart->getOrderTotal(false, Cart::ONLY_PRODUCTS) < $minimalPurchase)
+		$minimal_purchase = Tools::convertPrice((float)Configuration::get('PS_PURCHASE_MINIMUM'), $currency);
+		if ($this->context->cart->getOrderTotal(false, Cart::ONLY_PRODUCTS) < $minimal_purchase)
 			return '<p class="warning">'.sprintf(
 				Tools::displayError('A minimum purchase total of %1s (tax excl.) is required in order to validate your order, current purchase total is %2s (tax excl.).'),
 				Tools::displayPrice($minimal_purchase, $currency), Tools::displayPrice($this->context->cart->getOrderTotal(false, Cart::ONLY_PRODUCTS), $currency)