diff --git a/htdocs/bom/class/bom.class.php b/htdocs/bom/class/bom.class.php
index c0eb5e802ea..db03f6bf0bd 100644
--- a/htdocs/bom/class/bom.class.php
+++ b/htdocs/bom/class/bom.class.php
@@ -424,7 +424,7 @@ class BOM extends CommonObject
 		$sql .= " FROM ".$this->db->prefix().$objectline->table_element." as l";
 		$sql .= " LEFT JOIN ".$this->db->prefix()."product as p ON p.rowid = l.fk_product";
 		$sql .= " WHERE l.fk_".$this->db->escape($this->element)." = ".((int) $this->id);
-		$sql .= " AND p.fk_product_type = ". $typeproduct;
+		$sql .= " AND p.fk_product_type = ". ((int) $typeproduct);
 		if (isset($objectline->fields['position'])) {
 			$sql .= $this->db->order('position', 'ASC');
 		}