diff --git a/helpdesk/views/staff.py b/helpdesk/views/staff.py
index 981091bb..450ffac8 100644
--- a/helpdesk/views/staff.py
+++ b/helpdesk/views/staff.py
@@ -606,8 +606,8 @@ def update_messages_sent_to_by_public_and_status(
     ticket: Ticket,
     follow_up: FollowUp,
     context: str,
-    messages_sent_to: list[str],
-    files: list[str, str]
+    messages_sent_to: typing.List[str],
+    files: typing.List[str, str]
 ) -> Ticket:
     """Sets the status of the ticket"""
     if public and (