diff --git a/confirmation/migrations/0009_confirmation_expiry_date_backfill.py b/confirmation/migrations/0009_confirmation_expiry_date_backfill.py
index 6115a1c8ca..a041e6091b 100644
--- a/confirmation/migrations/0009_confirmation_expiry_date_backfill.py
+++ b/confirmation/migrations/0009_confirmation_expiry_date_backfill.py
@@ -21,7 +21,7 @@ def set_expiry_date_for_existing_confirmations(
     UNSUBSCRIBE = 4
     MULTIUSE_INVITE = 6
 
-    @transaction.atomic()
+    @transaction.atomic
     def backfill_confirmations_between(lower_bound: int, upper_bound: int) -> None:
         confirmations = Confirmation.objects.filter(id__gte=lower_bound, id__lte=upper_bound)
         for confirmation in confirmations:
diff --git a/tools/linter_lib/custom_check.py b/tools/linter_lib/custom_check.py
index c1c3d1d40c..f9a8b2b8a5 100644
--- a/tools/linter_lib/custom_check.py
+++ b/tools/linter_lib/custom_check.py
@@ -481,6 +481,10 @@ python_rules = RuleList(
             "pattern": "\\.(called(_once|_with|_once_with)?|not_called|has_calls|not_called)[(]",
             "description": 'A mock function is missing a leading "assert_"',
         },
+        {
+            "pattern": "@transaction.atomic\\(\\)",
+            "description": "Use @transaction.atomic as function decorator for consistency.",
+        },
         *whitespace_rules,
     ],
     max_length=110,