diff --git a/addons/account/wizard/account_automatic_reconcile.py b/addons/account/wizard/account_automatic_reconcile.py
index 81eeeacf7f2..c656ac18fd7 100644
--- a/addons/account/wizard/account_automatic_reconcile.py
+++ b/addons/account/wizard/account_automatic_reconcile.py
@@ -157,7 +157,7 @@ class account_automatic_reconcile(osv.osv_memory):
                 query = """SELECT partner_id FROM account_move_line WHERE account_id=%s AND reconcile_id IS NULL 
                 AND state <> 'draft' GROUP BY partner_id 
                 HAVING ABS(SUM(debit-credit)) < %s AND count(*)>0"""
-                params.append(max_amount)
+                params += max_amount
             # reconcile automatically all transactions from partners whose balance is 0
             cr.execute(query, params)
             partner_ids = [id for (id,) in cr.fetchall()]