diff --git a/neocalc.py b/neocalc.py
index 6fc4f117e20e163d8d8741ebddfaeca14cdbc1b0..2f1f5c1b38fa5097400fbe95b3f5ffacdbc88aea 100755
--- a/neocalc.py
+++ b/neocalc.py
@@ -1,4 +1,4 @@
-#!/bin/env python
+#!/bin/env python3
 from collections import namedtuple as nt
 import math
 from cmd import Cmd