diff --git a/app/dao/notification_usage_dao.py b/app/dao/notification_usage_dao.py
index ae4850a52..fe00b5145 100644
--- a/app/dao/notification_usage_dao.py
+++ b/app/dao/notification_usage_dao.py
@@ -52,11 +52,6 @@ def get_billing_data_for_month(service_id, start_date, end_date, notification_ty
     elif notification_type == LETTER_TYPE:
         results.extend(billing_letter_data_per_month_query(service_id, start_date, end_date))
 
-    if notification_type == LETTER_TYPE:
-        results.extend(billing_letter_data_per_month_query(
-            service_id=service_id, start_date=start_date, end_date=end_date)
-        )
-
     return results