diff --git a/data_steward/cdr_cleaner/clean_cdr.py b/data_steward/cdr_cleaner/clean_cdr.py
index 52412973e2..07f17437aa 100644
--- a/data_steward/cdr_cleaner/clean_cdr.py
+++ b/data_steward/cdr_cleaner/clean_cdr.py
@@ -386,7 +386,7 @@
     DataStage.DATA_CONSISTENCY.value:
         DATA_CONSISTENCY_CLEANING_CLASSES,
     DataStage.CRON_RETRACTION.value:
-        CRON_RETRACTION_CLEANING_CLASSES
+        CRON_RETRACTION_CLEANING_CLASSES,
     DataStage.SYNTHETIC.value:
         RDR_CLEANING_CLASSES + COMBINED_CLEANING_CLASSES +
         REGISTERED_TIER_DEID_CLEANING_CLASSES +