diff --git a/aleksis/core/mixins.py b/aleksis/core/mixins.py
index 5324b5e633460ca8dc73eb9788af1daf7f65fb94..a08295116a9c74c05f126d6b4f1c13454c9a4d64 100644
--- a/aleksis/core/mixins.py
+++ b/aleksis/core/mixins.py
@@ -17,7 +17,7 @@ from rules.contrib.admin import ObjectPermissionsModelAdmin
 
 
 @reversion.register()
-class ExtensibleModel:
+class ExtensibleModel(models.Model):
     """Base model for all objects in AlekSIS apps.
 
     This base model ensures all objects in AlekSIS apps fulfill the