diff --git a/PyNutil/coordinate_extraction.py b/PyNutil/coordinate_extraction.py
index 445aec05d7d04c4caaba822e48ebcfa69c4f685e..989ea9b22beb6f46af078ff84c5c3086bc6c0676 100644
--- a/PyNutil/coordinate_extraction.py
+++ b/PyNutil/coordinate_extraction.py
@@ -11,7 +11,7 @@ from skimage import measure
 import threading
 import re 
 
-def number_sections(filenames: List[str], legacy=False) -> List[int]:
+def number_sections(filenames, legacy=False):
     """
     returns the section numbers of filenames