diff --git a/cropduster/models.py b/cropduster/models.py
index 96682e9b..3f0e5d4e 100644
--- a/cropduster/models.py
+++ b/cropduster/models.py
@@ -15,7 +15,6 @@
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import connection, models
-from django.utils.encoding import python_2_unicode_compatible
 from django.core.files.storage import default_storage, FileSystemStorage
 
 import PIL.Image
@@ -45,7 +44,7 @@ def safe_str_path(file_path):
     return file_path
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class Thumb(models.Model):
 
     name = models.CharField(max_length=255, db_index=True)
@@ -214,7 +213,7 @@ def generate_filename(instance, filename):
     return filename
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class Image(models.Model):
 
     content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
diff --git a/cropduster/resizing.py b/cropduster/resizing.py
index 140341a1..a9c82088 100644
--- a/cropduster/resizing.py
+++ b/cropduster/resizing.py
@@ -11,7 +11,6 @@
 import PIL.Image
 
 from django.core.exceptions import ImproperlyConfigured
-from django.utils.encoding import python_2_unicode_compatible
 from django.core.files.storage import default_storage
 
 from .settings import CROPDUSTER_RETAIN_METADATA
@@ -23,7 +22,7 @@
 INFINITY = float('inf')
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class SizeAlias(object):
     is_alias = True
 
@@ -46,7 +45,7 @@ def add_to_sizes_dict(self, sizes):
         ctx.update(size_to)
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class Size(object):
 
     is_alias = False
diff --git a/cropduster/tests/models.py b/cropduster/tests/models.py
index 400eab83..c3c05539 100644
--- a/cropduster/tests/models.py
+++ b/cropduster/tests/models.py
@@ -1,5 +1,5 @@
+import six
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
 
 from cropduster.fields import ReverseForeignRelation
 from cropduster.models import CropDusterField, Size
@@ -76,7 +76,7 @@ class TestMultipleFieldsInheritanceChild(TestMultipleFieldsInheritanceParent):
         field_identifier="2")
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class TestReverseForeignRelA(models.Model):
     slug = models.SlugField()
     c = models.ForeignKey('TestReverseForeignRelC', on_delete=models.CASCADE)
@@ -90,7 +90,7 @@ def __str__(self):
         return self.slug
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class TestReverseForeignRelB(models.Model):
     slug = models.SlugField()
     c = models.ForeignKey('TestReverseForeignRelC', on_delete=models.CASCADE)
@@ -99,7 +99,7 @@ def __str__(self):
         return self.slug
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class TestReverseForeignRelC(models.Model):
     slug = models.SlugField()
     rel_a = ReverseForeignRelation(
@@ -110,7 +110,7 @@ def __str__(self):
         return self.slug
 
 
-@python_2_unicode_compatible
+@six.python_2_unicode_compatible
 class TestReverseForeignRelM2M(models.Model):
     slug = models.SlugField()
     m2m = models.ManyToManyField(TestReverseForeignRelC)