diff --git a/addons/mail/models/ir_model.py b/addons/mail/models/ir_model.py
index 386ff3760c9..7aadd09b02f 100644
--- a/addons/mail/models/ir_model.py
+++ b/addons/mail/models/ir_model.py
@@ -5,17 +5,6 @@ from odoo import _, api, fields, models
 from odoo.exceptions import UserError
 
 
-class Base(models.AbstractModel):
-    _inherit = 'base'
-
-    def _valid_field_parameter(self, field, name):
-        # allow tracking on abstract models; see also 'mail.thread'
-        return (
-            name == 'tracking' and self._abstract
-            or super()._valid_field_parameter(field, name)
-        )
-
-
 class IrModel(models.Model):
     _inherit = 'ir.model'
     _order = 'is_mail_thread DESC, name ASC'
diff --git a/addons/mail/models/models.py b/addons/mail/models/models.py
index 2c9aea4f144..c09eefbd10c 100644
--- a/addons/mail/models/models.py
+++ b/addons/mail/models/models.py
@@ -9,6 +9,13 @@ from odoo import api, models, tools, _
 class BaseModel(models.AbstractModel):
     _inherit = 'base'
 
+    def _valid_field_parameter(self, field, name):
+        # allow tracking on abstract models; see also 'mail.thread'
+        return (
+            name == 'tracking' and self._abstract
+            or super()._valid_field_parameter(field, name)
+        )
+
     # ------------------------------------------------------------
     # GENERIC MAIL FEATURES
     # ------------------------------------------------------------