diff --git a/htdocs/public/payment/newpayment.php b/htdocs/public/payment/newpayment.php
index cdfaaa2afc6..e1b215d4ebd 100644
--- a/htdocs/public/payment/newpayment.php
+++ b/htdocs/public/payment/newpayment.php
@@ -750,7 +750,8 @@ if (GETPOST("source") == 'contractline')
     if ($action != 'dopayment') // Do not change amount if we just click on first dopayment
     {
     	$amount=$contractline->total_ttc;
-    	if ($contractline->fk_product)
+
+    	if ($contractline->fk_product && ! empty($conf->global->PAYMENT_USE_NEW_PRICE_FOR_CONTRACTLINES))
     	{
     		$product=new Product($db);
     		$result=$product->fetch($contractline->fk_product);