diff --git a/mail_optional_autofollow/__manifest__.py b/mail_optional_autofollow/__manifest__.py
index 503e5ee..7536d34 100644
--- a/mail_optional_autofollow/__manifest__.py
+++ b/mail_optional_autofollow/__manifest__.py
@@ -8,9 +8,9 @@
     "author": "ACSONE SA/NV," "Odoo Community Association (OCA)",
     "website": "http://acsone.eu",
     "category": "Social Network",
-    "version": "11.0.1.0.0",
+    "version": "13.0.1.0.0",
     "license": "AGPL-3",
-    "depends": ["mail",],
-    "data": ["wizard/mail_compose_message_view.xml",],
+    "depends": ["mail"],
+    "data": ["wizard/mail_compose_message_view.xml"],
     "installable": True,
 }
diff --git a/mail_optional_autofollow/wizard/mail_compose_message.py b/mail_optional_autofollow/wizard/mail_compose_message.py
index 853b671..8b3dd08 100644
--- a/mail_optional_autofollow/wizard/mail_compose_message.py
+++ b/mail_optional_autofollow/wizard/mail_compose_message.py
@@ -21,7 +21,6 @@ class MailComposeMessage(models.TransientModel):
         followers on the related object""",
     )
 
-    @api.multi
     def send_mail(self, auto_commit=False):
         for wizard in self:
             super(