diff --git a/openerp/addons/base/res/res_currency.py b/openerp/addons/base/res/res_currency.py
index 1419cc7ccb4..b62ed300439 100644
--- a/openerp/addons/base/res/res_currency.py
+++ b/openerp/addons/base/res/res_currency.py
@@ -46,19 +46,19 @@ class res_currency(osv.osv):
         currency_rate_type = context.get('currency_rate_type_id') or None
         # ... and use 'is NULL' instead of '= some-id'.
         operator = '=' if currency_rate_type else 'is'
-        for id in ids:
+        for currency in self.browse(cr, uid, ids, context=context):
             cr.execute('SELECT rate FROM res_currency_rate '
                        'WHERE currency_id = %s '
                          'AND name <= %s '
                          'AND currency_rate_type_id ' + operator + ' %s '
                        'ORDER BY name desc LIMIT 1',
-                       (id, date, currency_rate_type))
+                       (currency.id, date, currency_rate_type))
             if cr.rowcount:
-                res[id] = cr.fetchone()[0]
+                res[currency.id] = cr.fetchone()[0]
             elif not raise_on_no_rate:
-                res[id] = 0
+                res[currency.id] = 0
             else:
-                raise osv.except_osv(_('Error!'),_("No currency rate associated for currency %d for the given period" % (id)))
+                raise osv.except_osv(_('Error!'),_("No currency rate associated for currency '%s' for the given period" % (currency.name)))
         return res
 
     _name = "res.currency"