diff --git a/planetstack/tools/diff-opencloud.py b/planetstack/tools/diff-opencloud.py
index 819fa45..4b6511c 100644
--- a/planetstack/tools/diff-opencloud.py
+++ b/planetstack/tools/diff-opencloud.py
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/env python
 
 import base64
 import os