diff --git a/tests/app_loading/not_installed/models.py b/tests/app_loading/not_installed/models.py
index 1e4b59894c..09cf2ac6ed 100644
--- a/tests/app_loading/not_installed/models.py
+++ b/tests/app_loading/not_installed/models.py
@@ -2,12 +2,22 @@ from django.db import models
 
 
 class NotInstalledModel(models.Model):
-    pass
+
+    class Meta:
+        app_label = 'not_installed'
 
 
 class RelatedModel(models.Model):
+
+    class Meta:
+        app_label = 'not_installed'
+
     not_installed = models.ForeignKey(NotInstalledModel)
 
 
 class M2MRelatedModel(models.Model):
+
+    class Meta:
+        app_label = 'not_installed'
+
     not_installed = models.ManyToManyField(NotInstalledModel)