diff --git a/htdocs/product/index.php b/htdocs/product/index.php
index 247ddf7d5ff..cc2d5e76599 100644
--- a/htdocs/product/index.php
+++ b/htdocs/product/index.php
@@ -113,8 +113,8 @@ $result = $db->query($sql);
 while ($objp = $db->fetch_object($result))
 {
 	$status=1;
-	if (! $objp->tosell && ! $objp->tobuy) $status=0;
-	$prodser[$objp->fk_product_type][$status]=$objp->total;
+	if (! $objp->tosell && ! $objp->tobuy) $status=0;	// To sell OR to buy
+	$prodser[$objp->fk_product_type][$status]+=$objp->total;
 }
 
 print '<table class="noborder" width="100%">';