diff --git a/tests/modeltests/custom_pk/fields.py b/tests/modeltests/custom_pk/fields.py
index d25eeca1d5..2494d5fd2c 100644
--- a/tests/modeltests/custom_pk/fields.py
+++ b/tests/modeltests/custom_pk/fields.py
@@ -22,8 +22,7 @@ class MyWrapper(object):
             return self.value == other.value
         return self.value == other
 
-class MyAutoField(models.CharField):
-    __metaclass__ = models.SubfieldBase
+class MyAutoField(six.with_metaclass(models.SubfieldBase, models.CharField)):
 
     def __init__(self, *args, **kwargs):
         kwargs['max_length'] = 10
diff --git a/tests/modeltests/field_subclassing/fields.py b/tests/modeltests/field_subclassing/fields.py
index 6fecbb63fc..a3867e3671 100644
--- a/tests/modeltests/field_subclassing/fields.py
+++ b/tests/modeltests/field_subclassing/fields.py
@@ -20,13 +20,12 @@ class Small(object):
     def __str__(self):
         return '%s%s' % (force_text(self.first), force_text(self.second))
 
-class SmallField(models.Field):
+class SmallField(six.with_metaclass(models.SubfieldBase, models.Field)):
     """
     Turns the "Small" class into a Django field. Because of the similarities
     with normal character fields and the fact that Small.__unicode__ does
     something sensible, we don't need to implement a lot here.
     """
-    __metaclass__ = models.SubfieldBase
 
     def __init__(self, *args, **kwargs):
         kwargs['max_length'] = 2
@@ -56,8 +55,7 @@ class SmallerField(SmallField):
     pass
 
 
-class JSONField(models.TextField):
-    __metaclass__ = models.SubfieldBase
+class JSONField(six.with_metaclass(models.SubfieldBase, models.TextField)):
 
     description = ("JSONField automatically serializes and desializes values to "
         "and from JSON.")
diff --git a/tests/modeltests/serializers/models.py b/tests/modeltests/serializers/models.py
index 290478607b..569f2cec49 100644
--- a/tests/modeltests/serializers/models.py
+++ b/tests/modeltests/serializers/models.py
@@ -99,8 +99,7 @@ class Team(object):
         return "%s" % self.title
 
 
-class TeamField(models.CharField):
-    __metaclass__ = models.SubfieldBase
+class TeamField(six.with_metaclass(models.SubfieldBase, models.CharField)):
 
     def __init__(self):
         super(TeamField, self).__init__(max_length=100)
diff --git a/tests/regressiontests/introspection/tests.py b/tests/regressiontests/introspection/tests.py
index 06736a68cb..e7cf7b9e1a 100644
--- a/tests/regressiontests/introspection/tests.py
+++ b/tests/regressiontests/introspection/tests.py
@@ -4,6 +4,7 @@ from functools import update_wrapper
 
 from django.db import connection
 from django.test import TestCase, skipUnlessDBFeature, skipIfDBFeature
+from django.utils import six
 
 from .models import Reporter, Article
 
@@ -35,8 +36,7 @@ class IgnoreNotimplementedError(type):
                 attrs[k] = ignore_not_implemented(v)
         return type.__new__(cls, name, bases, attrs)
 
-class IntrospectionTests(TestCase):
-    __metaclass__ = IgnoreNotimplementedError
+class IntrospectionTests(six.with_metaclass(IgnoreNotimplementedError, TestCase)):
 
     def test_table_names(self):
         tl = connection.introspection.table_names()
diff --git a/tests/regressiontests/model_forms_regress/tests.py b/tests/regressiontests/model_forms_regress/tests.py
index 3cb129f84e..90c907f2a6 100644
--- a/tests/regressiontests/model_forms_regress/tests.py
+++ b/tests/regressiontests/model_forms_regress/tests.py
@@ -485,9 +485,8 @@ class CustomMetaclass(ModelFormMetaclass):
         new.base_fields = {}
         return new
 
-class CustomMetaclassForm(forms.ModelForm):
-    __metaclass__ = CustomMetaclass
-
+class CustomMetaclassForm(six.with_metaclass(CustomMetaclass, forms.ModelForm)):
+    pass
 
 class CustomMetaclassTestCase(TestCase):
     def test_modelform_factory_metaclass(self):