diff --git a/mail_attach_existing_attachment/__openerp__.py b/mail_attach_existing_attachment/__openerp__.py
index 7ec7bbb6..2e5f1c74 100644
--- a/mail_attach_existing_attachment/__openerp__.py
+++ b/mail_attach_existing_attachment/__openerp__.py
@@ -38,4 +38,5 @@
     'data': [
         'wizard/mail_compose_message_view.xml',
     ],
+    'installable': False,
 }