1 files changed, 1 insertions, 2 deletions
diff --git a/quality_control/file_utils.py b/quality_control/file_utils.py
index fdce1e1..002f22c 100644
--- a/quality_control/file_utils.py
+++ b/quality_control/file_utils.py
@@ -1,10 +1,9 @@
 "Common file utilities"
 from typing import Union
 from pathlib import Path
-from io import TextIOWrapper
 from zipfile import ZipFile, is_zipfile
 
-def open_file(filepath: Union[str, Path]) -> Union[ZipFile, TextIOWrapper]:
+def open_file(filepath: Union[str, Path]):
     "Transparently open both TSV and ZIP files"
     if not is_zipfile(filepath):
         return open(filepath, encoding="utf-8")