diff --git a/demo.py b/demo.py
index 64b659c..869f329 100644
--- a/demo.py
+++ b/demo.py
@@ -1,4 +1,5 @@
 # -- coding: utf-8 --`
+import datetime
 import argparse
 import os
 # engine
@@ -69,6 +70,6 @@ def main(args):
     # inpainting
     parser.add_argument("--mask", type=str, default=None, help="mask of the region to inpaint on the initial image")
     # output name
-    parser.add_argument("--output", type=str, default="output.png", help="output image name")
+    parser.add_argument("--output", type=str, default="out_" + datetime.datetime.today().isoformat('_', 'seconds') + ".png", help="output image name")
     args = parser.parse_args()
-    main(args)
+    main(args)
\ No newline at end of file