diff --git a/CHANGELOG b/CHANGELOG
index d8dab1156f..746239b64d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Use tuple in Dict value instead of list
 * Do not set record name on title of report get_email
 * Add node to id of status
 * Use ImmutableDict for Transaction context
diff --git a/trytond/model/fields/dict.py b/trytond/model/fields/dict.py
index 7fd26241b3..758956cd9f 100644
--- a/trytond/model/fields/dict.py
+++ b/trytond/model/fields/dict.py
@@ -42,6 +42,9 @@ class Dict(Field):
                 # If stored as JSON conversion is done on backend
                 if isinstance(data, str):
                     data = json.loads(data, object_hook=JSONDecoder())
+                for key, val in data.items():
+                    if isinstance(val, list):
+                        data[key] = tuple(val)
                 dicts[value['id']] = ImmutableDict(data)
         return dicts
 
diff --git a/trytond/tests/test_field_dict.py b/trytond/tests/test_field_dict.py
index 280c50ccf5..948947e955 100644
--- a/trytond/tests/test_field_dict.py
+++ b/trytond/tests/test_field_dict.py
@@ -150,7 +150,7 @@ class FieldDictTestCase(unittest.TestCase):
                     'dico': {'countries': ['fr', 'be']},
                     }])
 
-        self.assertDictEqual(dict_.dico, {'countries': ['be', 'fr']})
+        self.assertDictEqual(dict_.dico, {'countries': ('be', 'fr')})
 
     @with_transaction()
     def test_invalid_selection_schema(self):