diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index a0981c6100a..65da0dc601b 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -1190,7 +1190,7 @@ class account_move_line(osv.osv):
             if state == 'done':
                 journal = journal_obj.read(cr, uid, journal_id, ['name'])
                 period = period_obj.read(cr, uid, period_id, ['name'])
-                 raise osv.except_osv(_('Error !'), _('You can not add/modify entries in a closed period %s of journal %s.' % (period['name'],journal['name'])))
+                raise osv.except_osv(_('Error !'), _('You can not add/modify entries in a closed period %s of journal %s.' % (period['name'],journal['name'])))
         if not result:
             journal = journal_obj.browse(cr, uid, journal_id, context=context)
             period = period_obj.browse(cr, uid, period_id, context=context)