diff --git a/keystone/receipt/__init__.py b/keystone/receipt/__init__.py
index a9dfa8b47e..37ebed18af 100644
--- a/keystone/receipt/__init__.py
+++ b/keystone/receipt/__init__.py
@@ -15,6 +15,6 @@
 from keystone.receipt import provider
 
 
-__all__ = [
+__all__ = (
     "provider",
-]
+)
diff --git a/keystone/receipt/providers/fernet/__init__.py b/keystone/receipt/providers/fernet/__init__.py
index b3f7d2ac9c..b5574acab0 100644
--- a/keystone/receipt/providers/fernet/__init__.py
+++ b/keystone/receipt/providers/fernet/__init__.py
@@ -15,6 +15,6 @@
 from keystone.receipt.providers.fernet.core import Provider
 
 
-__all__ = [
+__all__ = (
     "Provider",
-]
+)