diff --git a/stubs/icalendar/icalendar/tools.pyi b/stubs/icalendar/icalendar/tools.pyi
index 1886a37786f0..d58219227c0b 100644
--- a/stubs/icalendar/icalendar/tools.pyi
+++ b/stubs/icalendar/icalendar/tools.pyi
@@ -1,6 +1,6 @@
 import datetime
 from typing import Final
-from typing_extensions import TypeGuard
+from typing_extensions import TypeGuard, TypeIs
 
 from pytz.tzinfo import BaseTzInfo