diff --git a/tracking_manager/models/__init__.py b/tracking_manager/models/__init__.py
index 0617d405f..e97a88fcb 100644
--- a/tracking_manager/models/__init__.py
+++ b/tracking_manager/models/__init__.py
@@ -2,4 +2,3 @@ from . import mail_thread
 from . import ir_model
 from . import ir_model_fields
 from . import models
-from . import mail_tracking_value
diff --git a/tracking_manager/models/mail_tracking_value.py b/tracking_manager/models/mail_tracking_value.py
deleted file mode 100644
index 71c47567f..000000000
--- a/tracking_manager/models/mail_tracking_value.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# Copyright 2023 Akretion (https://www.akretion.com).
-# @author Sébastien BEAU <sebastien.beau@akretion.com>
-# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
-
-from odoo import models
-
-from ..tools import format_m2m
-
-
-class MailTrackingValue(models.Model):
-    _inherit = "mail.tracking.value"
-
-    def _create_tracking_values(
-        self,
-        initial_value,
-        new_value,
-        col_name,
-        col_info,
-        record,
-    ):
-        if col_info["type"] == "many2many":
-            col_info["type"] = "text"
-            initial_value = format_m2m(initial_value)
-            new_value = format_m2m(new_value)
-        return super()._create_tracking_values(
-            initial_value, new_value, col_name, col_info, record
-        )
diff --git a/tracking_manager/tests/test_tracking_manager.py b/tracking_manager/tests/test_tracking_manager.py
index 59f02bbe1..5f8a2e5e7 100644
--- a/tracking_manager/tests/test_tracking_manager.py
+++ b/tracking_manager/tests/test_tracking_manager.py
@@ -79,8 +79,8 @@ class TestTrackingManager(TransactionCase):
         self.assertEqual(len(self.messages), 1)
         tracking = self.messages.tracking_value_ids[0]
         self.assertEqual(len(tracking), 1)
-        self.assertEqual(tracking.old_value_text, "FOO")
-        self.assertEqual(tracking.new_value_text, "FOO; BAR")
+        self.assertEqual(tracking.old_value_char, "FOO")
+        self.assertEqual(tracking.new_value_char, "FOO, BAR")
 
     def test_m2m_delete_line(self):
         self.partner.write(
@@ -89,8 +89,8 @@ class TestTrackingManager(TransactionCase):
         self.assertEqual(len(self.messages), 1)
         tracking = self.messages.tracking_value_ids
         self.assertEqual(len(tracking), 1)
-        self.assertEqual(tracking.old_value_text, "FOO")
-        self.assertEqual(tracking.new_value_text, "")
+        self.assertEqual(tracking.old_value_char, "FOO")
+        self.assertEqual(tracking.new_value_char, "")
 
     def test_m2m_multi_line(self):
         self.partner.write(
@@ -110,8 +110,8 @@ class TestTrackingManager(TransactionCase):
         self.assertEqual(len(self.messages), 1)
         tracking = self.messages.tracking_value_ids
         self.assertEqual(len(tracking), 1)
-        self.assertEqual(tracking.old_value_text, "FOO")
-        self.assertEqual(tracking.new_value_text, "BAR; TOOH")
+        self.assertEqual(tracking.old_value_char, "FOO")
+        self.assertEqual(tracking.new_value_char, "BAR, TOOH")
 
     def test_o2m_create_indirectly(self):
         self.partner.write({"user_ids": [(Command.CREATE, 0, {"login": "1234567890"})]})