diff --git a/htdocs/product/price.php b/htdocs/product/price.php
index 6466e24caa1..57a7ee5fcaf 100644
--- a/htdocs/product/price.php
+++ b/htdocs/product/price.php
@@ -65,21 +65,30 @@ if ($_POST["action"] == 'update_price' &&
 		{
 			if($_POST["price_".$i])
 			{
-				if ($_POST["multiprices_base_type_".$i] == 'TTC')
+				// le prix 1 est considéré comme le prix de base du produit
+				if ($i == 1)
 				{
-					$price_ttc = price2num($_POST["price_".$i],'MU');
-					$price = price2num($_POST["price_".$i]) / (1 + ($product->tva_tx / 100));
-					$price = price2num($price,'MU');
+					$newprice=price2num($_POST["price_".$i],'MU');
+					$newpricebase=$_POST["multiprices_base_type_".$i];
 				}
 				else
 				{
-					$price = price2num($_POST["price_".$i],'MU');
-					$price_ttc = price2num($_POST["price_".$i]) * (1 + ($product->tva_tx / 100));
-					$price_ttc = price2num($price_ttc,'MU');
+					if ($_POST["multiprices_base_type_".$i] == 'TTC')
+				  {
+				  	$price_ttc = price2num($_POST["price_".$i],'MU');
+					  $price = price2num($_POST["price_".$i]) / (1 + ($product->tva_tx / 100));
+					  $price = price2num($price,'MU');
+				  }
+				  else
+				  {
+					  $price = price2num($_POST["price_".$i],'MU');
+					  $price_ttc = price2num($_POST["price_".$i]) * (1 + ($product->tva_tx / 100));
+					  $price_ttc = price2num($price_ttc,'MU');
+				  }
+				  $product->multiprices["$i"] = $price;
+				  $product->multiprices_ttc["$i"] = $price_ttc;
+				  $product->multiprices_base_type["$i"] = $_POST["multiprices_base_type_".$i];
 				}
-				$product->multiprices["$i"] = $price;
-				$product->multiprices_ttc["$i"] = $price_ttc;
-				$product->multiprices_base_type["$i"] = $_POST["multiprices_base_type_".$i];
 			}
 			else
 			{