diff --git a/falcon_toolkit/shell/parsers.py b/falcon_toolkit/shell/parsers.py
index 3c8d872..84dc266 100644
--- a/falcon_toolkit/shell/parsers.py
+++ b/falcon_toolkit/shell/parsers.py
@@ -555,7 +555,6 @@
     "-f",
     "--filename",
     help="Target tar filename. Relative or absolute.",
-    nargs=1,
     dest="filename",
 )
 tar_create_update_argparser = tar_argparser.add_mutually_exclusive_group(required=True)
diff --git a/falcon_toolkit/shell/prompt.py b/falcon_toolkit/shell/prompt.py
index 4c5031a..ba96c58 100644
--- a/falcon_toolkit/shell/prompt.py
+++ b/falcon_toolkit/shell/prompt.py
@@ -1043,7 +1043,7 @@ def do_tar(self, args):
         tar_file = args.filename
         mode = "-c" if args.create else "-u"
         source = args.source
-        if args.auto:
+        if args.compress_auto:
             compression = "-a"
         elif args.gzip:
             compression = "-z"