diff --git a/src/openalea/core/package.py b/src/openalea/core/package.py
index a5c75f3..aa8b20c 100644
--- a/src/openalea/core/package.py
+++ b/src/openalea/core/package.py
@@ -724,6 +724,7 @@ class PyPackageWriter(object):
     """ Write a wralea python file """
 
     wralea_template = """
+# -*- coding: latin-1 -*-
 # This file has been generated at $TIME
 
 from openalea.core import *