diff --git a/common/lib/xmodule/xmodule/course_module.py b/common/lib/xmodule/xmodule/course_module.py
index 697499b65e..499247cc2d 100644
--- a/common/lib/xmodule/xmodule/course_module.py
+++ b/common/lib/xmodule/xmodule/course_module.py
@@ -377,7 +377,7 @@ class CourseDescriptor(SequenceDescriptor):
         """
         return self.metadata.get('end_of_course_survey_url')
 
-    class TestCenterExam:
+    class TestCenterExam(object):
         def __init__(self, course_id, exam_name, exam_info):
             self.course_id = course_id
             self.exam_name = exam_name