diff --git a/htdocs/compta/facture/list.php b/htdocs/compta/facture/list.php
index 5456c8bb0a7..c57a00afbc1 100644
--- a/htdocs/compta/facture/list.php
+++ b/htdocs/compta/facture/list.php
@@ -759,7 +759,7 @@ $sql_order .= ' ORDER BY ';
 $listfield = explode(',', $sortfield);
 $listorder = explode(',', $sortorder);
 foreach ($listfield as $key => $value) {
-	$sql_order .= $listfield[$key].' '.($listorder[$key] ? $listorder[$key] : 'DESC').',';
+	$sql_order .= $listfield[$key] . ' ' . ($listorder[$key] ? $listorder[$key] : 'DESC') . ',';
 }
 $sql_order .= ' f.rowid DESC ';