diff --git a/common/lib/xmodule/xmodule/tests/__init__.py b/common/lib/xmodule/xmodule/tests/__init__.py
index c518d1afa0..b7e5ea8435 100644
--- a/common/lib/xmodule/xmodule/tests/__init__.py
+++ b/common/lib/xmodule/xmodule/tests/__init__.py
@@ -66,8 +66,8 @@ def get_test_system(course_id=''):
         node_path=os.environ.get("NODE_PATH", "/usr/local/lib/node_modules"),
         xblock_field_data=lambda descriptor: descriptor._field_data,
         anonymous_student_id='student',
-        open_ended_grading_interface= open_ended_grading_interface,
-        course_id=course_id
+        open_ended_grading_interface=open_ended_grading_interface,
+        course_id=course_id,
     )