diff --git a/addons/account/installer.py b/addons/account/installer.py
index a6376694175..ee279701eef 100644
--- a/addons/account/installer.py
+++ b/addons/account/installer.py
@@ -469,7 +469,7 @@ class account_installer(osv.osv_memory):
     def execute(self, cr, uid, ids, context=None):
         if context is None:
             context = {}
-        res_obj = self.pool.get('account.fiscalyear')
+        fy_obj = self.pool.get('account.fiscalyear')
         data_pool = self.pool.get('ir.model.data')
         obj_acc = self.pool.get('account.account')
         super(account_installer, self).execute(cr, uid, ids, context=context)
@@ -531,7 +531,7 @@ class account_installer(osv.osv_memory):
                         'company_id': company_id.id,
                         'sign': 1,
                         'parent_id':pur_tax_parent_id
-                        }
+                    }
                     new_tax_code = self.pool.get('account.tax.code').create(cr, uid, vals_tax_code)
                     purchase_tax = obj_tax.create(cr, uid,
                                             {'name':'TAX%s%%'%(p_tax*100),
@@ -566,11 +566,11 @@ class account_installer(osv.osv_memory):
                         'date_stop': res['date_stop'],
                         'company_id': res['company_id']
                        }
-                period_id = res_obj.create(cr, uid, vals, context=context)
+                fy_id = fy_obj.create(cr, uid, vals, context=context)
                 if res['period'] == 'month':
-                    res_obj.create_period(cr, uid, [period_id])
+                    fy_obj.create_period(cr, uid, [fy_id])
                 elif res['period'] == '3months':
-                    res_obj.create_period3(cr, uid, [period_id])
+                    fy_obj.create_period3(cr, uid, [fy_id])
 
 #        #fially inactive the demo chart of accounts
 #        data_id = data_pool.search(cr, uid, [('model','=','account.account'), ('name','=','chart0')])