diff --git a/addons/phone_validation/lib/phonenumbers_patch/__init__.py b/addons/phone_validation/lib/phonenumbers_patch/__init__.py
index aefdebdd434..e79f6d96a8e 100644
--- a/addons/phone_validation/lib/phonenumbers_patch/__init__.py
+++ b/addons/phone_validation/lib/phonenumbers_patch/__init__.py
@@ -27,5 +27,17 @@ try:
         # loading updated region_CI.py from current directory
         # https://github.com/daviddrysdale/python-phonenumbers/blob/v8.12.32/python/phonenumbers/data/region_CI.py
         phonenumbers.phonemetadata.PhoneMetadata.register_region_loader('CI', _local_load_region)
+    # MONKEY PATCHING phonemetadata to fix Brazilian phonenumbers following 2016 changes
+    def _hook_load_region(code):
+        phonenumbers.data._load_region(code)
+        if code == 'BR':
+            phonenumbers.data.region_BR.PHONE_METADATA_BR.intl_number_format.append(
+                phonenumbers.phonemetadata.NumberFormat(
+                    pattern='(\\d{2})(\\d{4})(\\d{4})',
+                    format='\\1 9\\2-\\3',
+                    leading_digits_pattern=['(?:[14689][1-9]|2[12478]|3[1-578]|5[13-5]|7[13-579][689])'],
+                )
+            )
+    phonenumbers.phonemetadata.PhoneMetadata.register_region_loader('BR', _hook_load_region)
 except ImportError:
     pass
diff --git a/addons/phone_validation/tests/test_phonenumbers_patch.py b/addons/phone_validation/tests/test_phonenumbers_patch.py
index f4376a107ba..a1d4d3321ce 100644
--- a/addons/phone_validation/tests/test_phonenumbers_patch.py
+++ b/addons/phone_validation/tests/test_phonenumbers_patch.py
@@ -11,6 +11,22 @@ from odoo.tools.parse_version import parse_version
 from odoo.addons.phone_validation.lib import phonenumbers_patch
 
 class TestPhonenumbersPatch(BaseCase):
+    def test_region_BR_monkey_patch(self):
+        """ Test Brazil phone numbers patch for added 9 in mobile numbers
+        It should not be added for fixed lines numbers"""
+        if not phonenumbers:
+            self.skipTest('Cannot test without phonenumbers module installed.')
+
+        # Mobile number => 9 should be added
+        parsed = phonenumbers.parse('11 6123 4567', region="BR")
+        formatted = phonenumbers.format_number(parsed, phonenumbers.PhoneNumberFormat.INTERNATIONAL)
+        self.assertEqual(formatted, '+55 11 96123-4567')
+
+        # Fixed line => 9 should not be added
+        parsed = phonenumbers.parse('11 2345 6789', region="BR")
+        formatted = phonenumbers.format_number(parsed, phonenumbers.PhoneNumberFormat.INTERNATIONAL)
+        self.assertEqual(formatted, '+55 11 2345-6789')
+
     def test_region_CI_monkey_patch(self):
         """Test if the  patch is apply on the good version of the lib
         And test some phonenumbers"""