diff --git a/demos/chat/chatdemo.py b/demos/chat/chatdemo.py
index ee3a9dce40..14539bb856 100755
--- a/demos/chat/chatdemo.py
+++ b/demos/chat/chatdemo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2009 Facebook
 # Copyright 2010 Dusty Phillips