diff --git a/tests/field_subclassing/fields.py b/tests/field_subclassing/fields.py
index c2158824df..b94b2372c1 100644
--- a/tests/field_subclassing/fields.py
+++ b/tests/field_subclassing/fields.py
@@ -1,13 +1,23 @@
 from __future__ import unicode_literals
 
 import json
+import warnings
 
 from django.db import models
 from django.utils.encoding import force_text
 from django.utils import six
+from django.utils.deprecation import RemovedInDjango20Warning
 from django.utils.encoding import python_2_unicode_compatible
 
 
+# Catch warning about subfieldbase  -- remove in Django 2.0
+warnings.filterwarnings(
+    'ignore',
+    'SubfieldBase has been deprecated. Use Field.from_db_value instead.',
+    RemovedInDjango20Warning
+)
+
+
 @python_2_unicode_compatible
 class Small(object):
     """
diff --git a/tests/field_subclassing/models.py b/tests/field_subclassing/models.py
index 59712fcab3..66e765ac3e 100644
--- a/tests/field_subclassing/models.py
+++ b/tests/field_subclassing/models.py
@@ -1,25 +1,13 @@
 """
 Tests for field subclassing.
 """
-
-import warnings
-
 from django.db import models
 from django.utils.encoding import force_text
-from django.utils.deprecation import RemovedInDjango20Warning
 
 from .fields import Small, SmallField, SmallerField, JSONField
 from django.utils.encoding import python_2_unicode_compatible
 
 
-# Catch warning about subfieldbase  -- remove in Django 2.0
-warnings.filterwarnings(
-    'ignore',
-    'SubfieldBase has been deprecated. Use Field.from_db_value instead.',
-    RemovedInDjango20Warning
-)
-
-
 @python_2_unicode_compatible
 class MyModel(models.Model):
     name = models.CharField(max_length=10)