diff --git a/tests/models.py b/tests/models.py
index b5efe55..10d6537 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -5,7 +5,7 @@ from django.utils.translation import gettext_lazy as _
 
 from model_utils import Choices
 from model_utils.fields import MonitorField, SplitField, StatusField, UUIDField
-from model_utils.managers import InheritanceManager, JoinManagerMixin, QueryManager
+from model_utils.managers import InheritanceManager, JoinManager, QueryManager
 from model_utils.models import (
     SoftDeletableModel,
     StatusModel,
@@ -418,10 +418,6 @@ class ModelWithCustomDescriptor(models.Model):
     tracker = FieldTracker(fields=['tracked_custom_field', 'tracked_regular_field'])
 
 
-class JoinManager(JoinManagerMixin, models.Manager):
-    pass
-
-
 class BoxJoinModel(models.Model):
     name = models.CharField(max_length=32)
     objects = JoinManager()