--- a/tests/test-stdio.py	Mon Nov 09 09:58:44 2020 -0800
+++ b/tests/test-stdio.py	Fri Nov 06 13:58:59 2020 -0800
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """
 Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`.
 """