diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 0ad025338d5..bbdc1d456ee 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -4245,7 +4245,7 @@ class Product extends CommonObject
     {
         $result=array();
 
-        $sql = "SELECT pb.batch, pb.eatby, pb.sellby, SUM(pb.qty) FROM ".MAIN_DB_PREFIX."product_batch as pb, ".MAIN_DB_PREFIX."product_stock as ps";
+        $sql = "SELECT pb.batch, pb.eatby, pb.sellby, SUM(pb.qty) AS qty FROM ".MAIN_DB_PREFIX."product_batch as pb, ".MAIN_DB_PREFIX."product_stock as ps";
         $sql.= " WHERE pb.fk_product_stock = ps.rowid AND ps.fk_product = ".$this->id." AND pb.batch = '".$this->db->escape($batch)."'";
         $sql.= " GROUP BY pb.batch, pb.eatby, pb.sellby";
         dol_syslog(get_class($this)."::loadBatchInfo load first entry found for lot/serial = ".$batch, LOG_DEBUG);