diff --git a/addons/mail/__init__.py b/addons/mail/__init__.py
index 805c27386f3..bac92a833ff 100644
--- a/addons/mail/__init__.py
+++ b/addons/mail/__init__.py
@@ -19,6 +19,7 @@
 #
 ##############################################################################
 
+import mail_message_subtype
 import mail_message
 import mail_thread
 import mail_group
diff --git a/addons/mail/__openerp__.py b/addons/mail/__openerp__.py
index ee22b0c153f..b8b359b8922 100644
--- a/addons/mail/__openerp__.py
+++ b/addons/mail/__openerp__.py
@@ -62,6 +62,7 @@ The main features of the module are:
     'depends': ['base', 'base_tools'],
     'data': [
         'wizard/mail_compose_message_view.xml',
+        'mail_message_subtype.xml',
         'mail_message_view.xml',
         'mail_subscription_view.xml',
         'mail_thread_view.xml',