diff --git a/stubs/python-dateutil/dateutil/parser/__init__.pyi b/stubs/python-dateutil/dateutil/parser/__init__.pyi
index c375ff158..68f96ff23 100644
--- a/stubs/python-dateutil/dateutil/parser/__init__.pyi
+++ b/stubs/python-dateutil/dateutil/parser/__init__.pyi
@@ -65,3 +65,4 @@ class _tzparser: ...
 DEFAULTTZPARSER: _tzparser
 
 class ParserError(ValueError): ...
+class UnknownTimezoneWarning(RuntimeWarning): ...