diff --git a/mass_mailing_custom_unsubscribe_event/__manifest__.py b/mass_mailing_custom_unsubscribe_event/__manifest__.py
index d0bb44b16..a05202809 100644
--- a/mass_mailing_custom_unsubscribe_event/__manifest__.py
+++ b/mass_mailing_custom_unsubscribe_event/__manifest__.py
@@ -4,15 +4,10 @@
     "name": "Allow to unsubscribe discretely from an event",
     "category": "Marketing",
     "version": "12.0.1.0.1",
-    "depends": [
-        "event",
-        "mass_mailing_custom_unsubscribe",
-    ],
+    "depends": ["event", "mass_mailing_custom_unsubscribe"],
     "author": "Tecnativa, Odoo Community Association (OCA)",
     "website": "https://github.com/OCA/social",
-    "data": [
-        "views/event_registration_views.xml",
-    ],
+    "data": ["views/event_registration_views.xml"],
     "license": "AGPL-3",
     "installable": True,
     "auto_install": True,
diff --git a/mass_mailing_custom_unsubscribe_event/models/event_registration.py b/mass_mailing_custom_unsubscribe_event/models/event_registration.py
index 1fd67a4d6..80afcd8ff 100644
--- a/mass_mailing_custom_unsubscribe_event/models/event_registration.py
+++ b/mass_mailing_custom_unsubscribe_event/models/event_registration.py
@@ -5,10 +5,11 @@ from odoo import fields, models
 
 
 class EventRegistration(models.Model):
-    _inherit = 'event.registration'
+    _inherit = "event.registration"
 
     opt_out = fields.Boolean(
-        string='Opt-Out',
+        string="Opt-Out",
         help="If opt-out is checked, this registree has refused to receive "
-             "emails for mass mailing and marketing campaign.")
+        "emails for mass mailing and marketing campaign.",
+    )
     # No need of email field, as it already exists