diff --git a/mail_activity_done/models/__init__.py b/mail_activity_done/models/__init__.py
index a28b2462f3..1ff3880296 100644
--- a/mail_activity_done/models/__init__.py
+++ b/mail_activity_done/models/__init__.py
@@ -1,2 +1 @@
 from . import mail_activity
-from . import res_users
diff --git a/mail_activity_done/models/res_users.py b/mail_activity_done/models/res_users.py
deleted file mode 100644
index 986decb7d1..0000000000
--- a/mail_activity_done/models/res_users.py
+++ /dev/null
@@ -1,59 +0,0 @@
-# Copyright 2018-22 ForgeFlow <http://www.forgeflow.com>
-# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html).
-from odoo import api, fields, models, modules
-
-
-class ResUsers(models.Model):
-    _inherit = "res.users"
-
-    @api.model
-    def systray_get_activities(self):
-        # Here we totally override the method. Not very nice, but
-        # we should perhaps ask Odoo to add a hook here.
-        query = """SELECT m.id, count(*), act.res_model as model,
-                        CASE
-                            WHEN %(today)s::date -
-                            act.date_deadline::date = 0 Then 'today'
-                            WHEN %(today)s::date -
-                            act.date_deadline::date > 0 Then 'overdue'
-                            WHEN %(today)s::date -
-                            act.date_deadline::date < 0 Then 'planned'
-                        END AS states
-                    FROM mail_activity AS act
-                    JOIN ir_model AS m ON act.res_model_id = m.id
-                    WHERE user_id = %(user_id)s
-                    AND act.done = False
-                    GROUP BY m.id, states, act.res_model;
-                    """
-        self.env.cr.execute(
-            query, {"today": fields.Date.context_today(self), "user_id": self.env.uid}
-        )
-        activity_data = self.env.cr.dictfetchall()
-        model_ids = [a["id"] for a in activity_data]
-        model_names = {
-            n[0]: n[1] for n in self.env["ir.model"].sudo().browse(model_ids).name_get()
-        }
-
-        user_activities = {}
-        for activity in activity_data:
-            if not user_activities.get(activity["model"]):
-                module = self.env[activity["model"]]._original_module
-                icon = module and modules.module.get_module_icon(module)
-                user_activities[activity["model"]] = {
-                    "id": activity["id"],
-                    "name": model_names[activity["id"]],
-                    "model": activity["model"],
-                    "icon": icon,
-                    "total_count": 0,
-                    "today_count": 0,
-                    "overdue_count": 0,
-                    "planned_count": 0,
-                    "type": "activity",
-                }
-            user_activities[activity["model"]][
-                "%s_count" % activity["states"]
-            ] += activity["count"]
-            if activity["states"] in ("today", "overdue"):
-                user_activities[activity["model"]]["total_count"] += activity["count"]
-
-        return list(user_activities.values())