diff --git a/contrib/courier-to-mailman.py b/contrib/courier-to-mailman.py

index 922401f..572b47d 100644

--- a/contrib/courier-to-mailman.py

+++ b/contrib/courier-to-mailman.py

@@ -1,4 +1,4 @@

-#! /usr/bin/python

+#! /usr/bin/python2

 # Configuration variables - Change these for your site if necessary.

 #

diff --git a/tests/onebounce.py b/tests/onebounce.py

index 85f3b98..b54d075 100755

--- a/tests/onebounce.py

+++ b/tests/onebounce.py

@@ -1,4 +1,4 @@

-#! /usr/bin/python

+#! /usr/bin/python2

 # Copyright (C) 2002-2018 by the Free Software Foundation, Inc.

 #

diff --git a/bin/msgfmt.py b/bin/msgfmt.py

index 8a2d4e6..27a40bf 100755

--- a/bin/msgfmt.py

+++ b/bin/msgfmt.py

@@ -1,4 +1,4 @@

-#! /usr/bin/env python

+#!/usr/bin/python2

 # -*- coding: iso-8859-1 -*-

 # Written by Martin v. Löwis <loewis@informatik.hu-berlin.de>

diff --git a/Mailman/Archiver/pipermail.py b/Mailman/Archiver/pipermail.py

index cfca480..3d6a9d6 100644

--- a/Mailman/Archiver/pipermail.py

+++ b/Mailman/Archiver/pipermail.py

@@ -1,4 +1,4 @@

-#! /usr/bin/env python

+#! /usr/bin/python2

 from __future__ import nested_scopes

diff --git a/Mailman/Archiver/pipermail.py.unicode b/Mailman/Archiver/pipermail.py.unicode

index 62fb92e..a663829 100644

--- a/Mailman/Archiver/pipermail.py.unicode

+++ b/Mailman/Archiver/pipermail.py.unicode

@@ -1,4 +1,4 @@

-#! /usr/bin/env python

+#! /usr/bin/python2

 from __future__ import nested_scopes

diff --git a/Mailman/Post.py b/Mailman/Post.py

index 7f86696..b4dcfb0 100644

--- a/Mailman/Post.py

+++ b/Mailman/Post.py

@@ -1,4 +1,4 @@

-#! /usr/bin/env python

+#! /usr/bin/python2

 #

 # Copyright (C) 2001-2018 by the Free Software Foundation, Inc.

 #

diff --git a/tests/fblast.py b/tests/fblast.py

index 092e420..905401d 100644

--- a/tests/fblast.py

+++ b/tests/fblast.py

@@ -1,4 +1,4 @@

-#! /usr/bin/env python

+#! /usr/bin/python2

 """Throw email at Mailman as fast as you can.

 This is not a unit test, it's a functional test, so you can't run it within