1 files changed, 1 insertions, 1 deletions
diff --git a/lib.py b/lib.py
index f1d75df..6d1fec8 100644
--- a/lib.py
+++ b/lib.py
@@ -488,4 +488,4 @@ def main(graph, argv, *args, **kws):
         ext = argv[1] if len(argv) > 1 else 'pdf'
         fmt = {'dot': 'raw'}.get(ext, ext)
         output += extsep + ext
-        gen_graph(graph, **kws).write(output, format=fmt, prog=('dot',) + args)
+        gen_graph(graph, **kws).write(output, format=fmt, prog=['dot'].extend(args))