--- src/fs_copy_file_range_unsupported.icpp.orig	2025-08-16 08:24:30 UTC
+++ src/fs_copy_file_range_unsupported.icpp
@@ -31,7 +31,7 @@ namespace fs
                   int64_t            *off_in_,
                   const int           fd_out_,
                   int64_t            *off_out_,
-                  const size_t        len_,
+                  const uint64_t      len_,
                   const unsigned int  flags_)
   {
     return (errno=EOPNOTSUPP,-1);