diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index c92b94b0b6e..a8803d6e5e8 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -1002,7 +1002,7 @@ class Product extends CommonObject
 			else
 			{
 				$price = price2num($newprice,'MU');
-				$price_ttc = price2num($newprice) * (1 + ($newvat / 100));
+				$price_ttc = ( $newnpr != 1 ) ? price2num($newprice) * (1 + ($newvat / 100)) : $price;
 				$price_ttc = price2num($price_ttc,'MU');
 
 				if ($newminprice!='' || $newminprice==0)