diff --git a/addons/mail/wizard/mail_compose_message_view.xml b/addons/mail/wizard/mail_compose_message_view.xml
index 82c96f9eb80..a10dc6ccc86 100644
--- a/addons/mail/wizard/mail_compose_message_view.xml
+++ b/addons/mail/wizard/mail_compose_message_view.xml
@@ -50,6 +50,7 @@
class="oe_mail_compose_message_body_html"
attrs="{'invisible':[('content_subtype', '=', 'plain')]}"/>