diff --git a/test/core/bad_client/gen_build_yaml.py b/test/core/bad_client/gen_build_yaml.py
index 02dda10be0f..3df889ecdaf 100755
--- a/test/core/bad_client/gen_build_yaml.py
+++ b/test/core/bad_client/gen_build_yaml.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/test/core/end2end/gen_build_yaml.py b/test/core/end2end/gen_build_yaml.py
index 46cdb80c863..9988950a6e5 100755
--- a/test/core/end2end/gen_build_yaml.py
+++ b/test/core/end2end/gen_build_yaml.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/test/core/httpcli/test_server.py b/test/core/httpcli/test_server.py
index babfe84ddca..4aaf5e30f8d 100755
--- a/test/core/httpcli/test_server.py
+++ b/test/core/httpcli/test_server.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 """Server for httpcli_test"""
 
diff --git a/tools/buildgen/build-cleaner.py b/tools/buildgen/build-cleaner.py
index 939143c4cbc..6c9c6b3749e 100755
--- a/tools/buildgen/build-cleaner.py
+++ b/tools/buildgen/build-cleaner.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/buildgen/mako_renderer.py b/tools/buildgen/mako_renderer.py
index abb8df2141a..f1b28d352e7 100755
--- a/tools/buildgen/mako_renderer.py
+++ b/tools/buildgen/mako_renderer.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/distrib/check_copyright.py b/tools/distrib/check_copyright.py
index 1d09ed42a57..fac2a5af09c 100755
--- a/tools/distrib/check_copyright.py
+++ b/tools/distrib/check_copyright.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python2.7
+#!/usr/bin/env python2.7
 
 # Copyright 2015, Google Inc.
 # All rights reserved.
diff --git a/tools/distrib/python/docgen.py b/tools/distrib/python/docgen.py
index 2acd3cc12f2..4ac8f9c64a8 100755
--- a/tools/distrib/python/docgen.py
+++ b/tools/distrib/python/docgen.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/distrib/python/submit.py b/tools/distrib/python/submit.py
index 909ba563270..dffbefd5fe4 100755
--- a/tools/distrib/python/submit.py
+++ b/tools/distrib/python/submit.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/profile_analyzer/profile_analyzer.py b/tools/profile_analyzer/profile_analyzer.py
index a78f84e5e64..e5e9a28a92d 100755
--- a/tools/profile_analyzer/profile_analyzer.py
+++ b/tools/profile_analyzer/profile_analyzer.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/run_tests/antagonist.py b/tools/run_tests/antagonist.py
index 111839ccf93..857addfb386 100755
--- a/tools/run_tests/antagonist.py
+++ b/tools/run_tests/antagonist.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/run_tests/port_server.py b/tools/run_tests/port_server.py
index acb6deaae67..da76230ad5d 100755
--- a/tools/run_tests/port_server.py
+++ b/tools/run_tests/port_server.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index 13d60e6f7b4..a1d0376a4fa 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright 2015, Google Inc.
 # All rights reserved.
 #