diff --git a/gitlib/gitlib.py b/gitlib/gitlib.py
index b03d3cd..9d5506b 100755
--- a/gitlib/gitlib.py
+++ b/gitlib/gitlib.py
@@ -1556,12 +1556,13 @@ if __name__ == '__main__':
 
     ntfs_impl = NTFSImplementation.Kernel
 
-    if args.ntfs_type == "kernel":
-        ntfs_impl = NTFSImplementation.Kernel
-    elif args.ntfs_type == "fuse":
-        ntfs_impl = NTFSImplementation.NTFS3G
-    else:
-        raise ValueError("Unknown NTFS implementation: {args.ntfs_type}")
+    if not args.ntfs_type is None:
+        if args.ntfs_type == "kernel":
+            ntfs_impl = NTFSImplementation.Kernel
+        elif args.ntfs_type == "fuse":
+            ntfs_impl = NTFSImplementation.NTFS3G
+        else:
+            raise ValueError(f"Unknown NTFS implementation: {args.ntfs_type}")
 
 
     og_git = OpengnsysGitLibrary(ntfs_implementation = ntfs_impl)