diff --git a/PFERD/output_dir.py b/PFERD/output_dir.py
index a0c5a1a..09cf133 100644
--- a/PFERD/output_dir.py
+++ b/PFERD/output_dir.py
@@ -9,7 +9,7 @@ from dataclasses import dataclass
 from datetime import datetime
 from enum import Enum
 from pathlib import Path, PurePath
-from typing import BinaryIO, ClassVar, Iterator, Optional, Tuple
+from typing import BinaryIO, Iterator, Optional, Tuple
 
 from .logging import log
 from .report import Report, ReportLoadError