diff --git a/src/paperless_mail/mail.py b/src/paperless_mail/mail.py
index 37a9ab186..83771dbf5 100644
--- a/src/paperless_mail/mail.py
+++ b/src/paperless_mail/mail.py
@@ -658,7 +658,7 @@ class MailAccountHandler(LoggingMixin):
 
     def filename_exclusion_matches(
         self,
-        filter_attachment_filename_exclude: str | None,
+        filter_attachment_filename_exclude: Optional[str],
         filename: str,
     ) -> bool:
         if filter_attachment_filename_exclude: