diff --git a/app/delivery/send_to_providers.py b/app/delivery/send_to_providers.py
index 4499fb8a86..d6c5297391 100644
--- a/app/delivery/send_to_providers.py
+++ b/app/delivery/send_to_providers.py
@@ -342,9 +342,9 @@ def update_notification_to_sending(notification, provider):
 def provider_to_use(
     notification_type: str,
     notification_id: UUID,
-    to: Union[str, None] = None,
+    to: Optional[str] = None,
     international: bool = False,
-    sender: Union[str, None] = None,
+    sender: Optional[str] = None,
 ) -> Any:
     """
     Get the provider to use for sending the notification.