diff --git a/htdocs/admin/facture.php b/htdocs/admin/facture.php
index 4750f8052d5..5b1a8a99135 100644
--- a/htdocs/admin/facture.php
+++ b/htdocs/admin/facture.php
@@ -39,7 +39,7 @@ $facture_rib_number_var = FACTURE_RIB_NUMBER;
 
 if ($action == 'set')
 {
-  $sql = "REPLACE INTO llx_const SET name = 'FACTURE_ADDON', value='".$value."', visible=0";
+  $sql = "REPLACE INTO llx_const SET name = 'FACTURE_ADDON', value='".$value."', visible=0, type='chaine'";
 
   if ($db->query($sql))
     {