diff --git a/eris/eris/tools.py b/eris/eris/tools.py
index 8c91d2d..67ff6df 100755
--- a/eris/eris/tools.py
+++ b/eris/eris/tools.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3.9
+#!/usr/bin/env python3.9
 # -*- coding: utf-8 -*-