diff --git a/Demo/sgi/cd/listcd.py b/Demo/sgi/cd/listcd.py
index 299cd982f45..5017851e618 100755
--- a/Demo/sgi/cd/listcd.py
+++ b/Demo/sgi/cd/listcd.py
@@ -20,3 +20,5 @@ def main():
 def z(n):
 	s = `n`
 	return '0' * (2 - len(s)) + s
+
+main()