diff --git a/mediagoblin/tests/test_sql_migrations.py b/mediagoblin/tests/test_sql_migrations.py
index 7a49a4a5..7dfc4b26 100644
--- a/mediagoblin/tests/test_sql_migrations.py
+++ b/mediagoblin/tests/test_sql_migrations.py
@@ -489,7 +489,7 @@ def _insert_migration3_objects(session):
     session.commit()
 
 
-def CollectingPrinter(object):
+class CollectingPrinter(object):
     def __init__(self):
         self.collection = []