diff --git a/htdocs/compta/facture/impayees.php b/htdocs/compta/facture/impayees.php
index 320d86f3377..c762aac5702 100644
--- a/htdocs/compta/facture/impayees.php
+++ b/htdocs/compta/facture/impayees.php
@@ -429,7 +429,8 @@ if ($search_paymentmode)     $sql .= " AND f.fk_mode_reglement = ".$search_payme
 if ($search_montant_ht)  $sql .= " AND f.total = '".$db->escape($search_montant_ht)."'";
 if ($search_montant_ttc) $sql .= " AND f.total_ttc = '".$db->escape($search_montant_ttc)."'";
 if (GETPOST('sf_ref'))   $sql .= " AND f.facnumber LIKE '%".$db->escape(GETPOST('sf_ref'))."%'";
-$sql.= " GROUP BY s.nom, s.rowid, s.email, f.rowid, f.facnumber, f.increment, f.total, f.tva, f.total_ttc, f.localtax1, f.localtax2, f.revenuestamp, f.datef, f.date_lim_reglement, f.paye, f.fk_statut, f.type ";
+$sql.= " GROUP BY s.nom, s.rowid, s.email, f.rowid, f.facnumber, f.ref_client, f.increment, f.total, f.tva, f.total_ttc, f.localtax1, f.localtax2, f.revenuestamp,";
+$sql.= " f.datef, f.date_lim_reglement, f.paye, f.fk_statut, f.type, fk_mode_reglement";
 if (! $user->rights->societe->client->voir && ! $socid) $sql .= ", sc.fk_soc, sc.fk_user ";
 $sql.= " ORDER BY ";
 $listfield=explode(',',$sortfield);