/usr/local/bin/python -> /usr/bin/env python
diff --git a/Demo/scripts/fact.py b/Demo/scripts/fact.py
index bf49afc..6cc389e 100755
--- a/Demo/scripts/fact.py
+++ b/Demo/scripts/fact.py
@@ -1,4 +1,4 @@
-#! /usr/local/bin/python
+#! /usr/bin/env python
 
 # Factorize numbers.
 # The algorithm is not efficient, but easy to understand.