diff --git a/addons/mrp/models/mrp_workorder.py b/addons/mrp/models/mrp_workorder.py
index e05bfe2c388..f100c361984 100644
--- a/addons/mrp/models/mrp_workorder.py
+++ b/addons/mrp/models/mrp_workorder.py
@@ -14,7 +14,6 @@ from odoo.tools import float_compare, float_round, format_datetime
 class MrpWorkorder(models.Model):
     _name = 'mrp.workorder'
     _description = 'Work Order'
-    _inherit = ['mail.thread', 'mail.activity.mixin']
 
     def _read_group_workcenter_id(self, workcenters, domain, order):
         workcenter_ids = self.env.context.get('default_workcenter_id')
diff --git a/addons/mrp/views/mrp_workorder_views.xml b/addons/mrp/views/mrp_workorder_views.xml
index c582a0d3e9e..3da178e2851 100644
--- a/addons/mrp/views/mrp_workorder_views.xml
+++ b/addons/mrp/views/mrp_workorder_views.xml
@@ -14,13 +14,6 @@
                 <filter string="Late" name="late" domain="[('date_planned_start','&lt;=',time.strftime('%%Y-%%m-%%d'))]"/>
                 <separator/>
                 <filter string="Start Date" name="date_start_filter" date="date_start"/>
-                <filter invisible="1" string="Late Activities" name="activities_overdue"
-                    domain="[('activity_ids.date_deadline', '&lt;', context_today().strftime('%Y-%m-%d'))]"
-                    help="Show all records which has next action date is before today"/>
-                <filter invisible="1" string="Today Activities" name="activities_today"
-                    domain="[('activity_ids.date_deadline', '=', context_today().strftime('%Y-%m-%d'))]"/>
-                <filter invisible="1" string="Future Activities" name="activities_upcoming_all"
-                    domain="[('activity_ids.date_deadline', '&gt;', context_today().strftime('%Y-%m-%d'))]"/>
             </search>
         </field>
     </record>
@@ -241,13 +234,6 @@
                 <separator/>
                 <filter string="Late" name="late" domain="['&amp;', ('date_planned_start', '&lt;', current_date), ('state', '=', 'ready')]"
                     help="Production started late"/>
-                <filter invisible="1" string="Late Activities" name="activities_overdue"
-                    domain="[('activity_ids.date_deadline', '&lt;', context_today().strftime('%Y-%m-%d'))]"
-                    help="Show all records which has next action date is before today"/>
-                <filter invisible="1" string="Today Activities" name="activities_today"
-                    domain="[('activity_ids.date_deadline', '=', context_today().strftime('%Y-%m-%d'))]"/>
-                <filter invisible="1" string="Future Activities" name="activities_upcoming_all"
-                    domain="[('activity_ids.date_deadline', '&gt;', context_today().strftime('%Y-%m-%d'))]"/>
                 <group expand="0" string="Group By">
                     <filter string="Work Center" name="work_center" domain="[]" context="{'group_by': 'workcenter_id'}"/>
                     <filter string="Manufacturing Order" name="production" domain="[]" context="{'group_by': 'production_id'}"/>