diff --git a/src/backend/marsha/core/simple_jwt/factories.py b/src/backend/marsha/core/simple_jwt/factories.py
index 7eb90857e3..2dea956228 100644
--- a/src/backend/marsha/core/simple_jwt/factories.py
+++ b/src/backend/marsha/core/simple_jwt/factories.py
@@ -3,10 +3,10 @@
 import uuid
 
 from django.conf import settings
-from rest_framework_simplejwt.exceptions import TokenError
 
 import factory
 from faker.utils.text import slugify
+from rest_framework_simplejwt.exceptions import TokenError
 
 from marsha.core.factories import (
     ConsumerSiteFactory,
@@ -141,13 +141,13 @@ class BaseResourceTokenFactory(BaseTokenFactory):
     """
 
     @staticmethod
-    def get_playlist_id(o):
-        """Get the playlist id from the resource."""
+    def get_playlist_id(params):
+        """Ensure the resource is a playlist."""
         resource_id = uuid.uuid4()
-        if not o.resource:
+        if not params.resource:
             pass
-        elif isinstance(o.resource, Playlist):
-            resource_id = o.resource.id
+        elif isinstance(params.resource, Playlist):
+            resource_id = params.resource.id
         else:
             raise TokenError("resource is not a playlist")