diff --git a/data/pel_variables.py b/data/pel_variables.py
index f5aa729..aec1b8b 100644
--- a/data/pel_variables.py
+++ b/data/pel_variables.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 
 r"""
 Contains PEL related constants.