diff --git a/app/dao/services_dao.py b/app/dao/services_dao.py
index b9ad66ae9..867f103b3 100644
--- a/app/dao/services_dao.py
+++ b/app/dao/services_dao.py
@@ -267,13 +267,13 @@ def dao_fetch_monthly_historical_stats_for_service(service_id, year):
     )
 
     months = {
-        datetime.strftime(date, '%Y-%m'): dict.fromkeys(
-            TEMPLATE_TYPES,
-            dict.fromkeys(
+        datetime.strftime(date, '%Y-%m'): {
+            template_type: dict.fromkeys(
                 NOTIFICATION_STATUS_TYPES,
                 0
             )
-        )
+            for template_type in TEMPLATE_TYPES
+        }
         for date in [
             datetime(year, month, 1) for month in range(4, 13)
         ] + [
diff --git a/tests/app/dao/test_services_dao.py b/tests/app/dao/test_services_dao.py
index af72342d0..6e4afa8b3 100644
--- a/tests/app/dao/test_services_dao.py
+++ b/tests/app/dao/test_services_dao.py
@@ -545,8 +545,8 @@ def test_fetch_monthly_historical_stats_separates_weeks(notify_db, notify_db_ses
         ('2017-03', 'created', 2),
     ):
         assert result[date]['sms'][status] == count
-        assert result[date]['email'][status] == count
-        assert result[date]['letter'][status] == count
+        assert result[date]['email'][status] == 0
+        assert result[date]['letter'][status] == 0
 
     assert result.keys() == {
         '2016-04', '2016-05', '2016-06',