diff --git a/account_banking_mandate/models/account_banking_mandate.py b/account_banking_mandate/models/account_banking_mandate.py
index 0dcab8b1a..b225b906f 100644
--- a/account_banking_mandate/models/account_banking_mandate.py
+++ b/account_banking_mandate/models/account_banking_mandate.py
@@ -16,7 +16,7 @@ class AccountBankingMandate(models.Model):
 
     _name = "account.banking.mandate"
     _description = "A generic banking mandate"
-    _inherit = ["mail.thread"]
+    _inherit = ["mail.thread", "mail.activity.mixin"]
     _order = "signature_date desc"
 
     def _get_default_partner_bank_id_domain(self):
diff --git a/account_banking_mandate/views/account_banking_mandate_view.xml b/account_banking_mandate/views/account_banking_mandate_view.xml
index 567fcc5a3..3dd6b69a0 100644
--- a/account_banking_mandate/views/account_banking_mandate_view.xml
+++ b/account_banking_mandate/views/account_banking_mandate_view.xml
@@ -68,6 +68,7 @@
                 </sheet>
                 <div class="oe_chatter">
                     <field name="message_follower_ids" widget="mail_followers" />
+                    <field name="activity_ids" widget="mail_activity" />
                     <field name="message_ids" widget="mail_thread" />
                 </div>
             </form>