diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 9216e1171bd..f89af703b2a 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -393,8 +393,13 @@ class purchase_order(osv.osv):
             compose_form_id = ir_model_data.get_object_reference(cr, uid, 'mail', 'email_compose_message_wizard_form')[1]
         except ValueError:
             compose_form_id = False 
-        ctx = dict(context, active_model='purchase.order', active_id=ids[0])
-        ctx.update({'mail.compose.template_id': template_id})
+        ctx = dict(context)
+        ctx.update({
+            'default_model': 'purchase.order',
+            'default_res_id': ids[0],
+            'default_use_template': True,
+            'default_template_id': template_id,
+            })
         wf_service = netsvc.LocalService("workflow")
         return {
             'type': 'ir.actions.act_window',