--- a/hgext/largefiles/proto.py	Mon Dec 16 20:38:13 2024 -0500
+++ b/hgext/largefiles/proto.py	Mon Dec 16 20:40:04 2024 -0500
@@ -74,7 +74,7 @@
 
     # TODO: fix the fd leak here
     f = open(filename, 'rb')
-    length = os.fstat(f.fileno())[6]
+    length = os.fstat(f.fileno()).st_size
 
     # Since we can't set an HTTP content-length header here, and
     # Mercurial core provides no way to give the length of a streamres