diff --git a/product/ERP5/Document/TradeModelRule.py b/product/ERP5/Document/TradeModelRule.py
index b99cae46c995d405ac4c2f9fc4c7bb0548d0d909..322b475d354c5893e01cd92ebc0b938ece3042b4 100644
--- a/product/ERP5/Document/TradeModelRule.py
+++ b/product/ERP5/Document/TradeModelRule.py
@@ -1,4 +1,4 @@
-# -*- coding: utf8 -*-
+# -*- coding: utf-8 -*-
 ##############################################################################
 #
 # Copyright (c) 2009 Nexedi SARL and Contributors. All Rights Reserved.