diff --git a/test/core/bad_client/gen_build_yaml.py b/test/core/bad_client/gen_build_yaml.py
index 02dda10be0f4a377ceddffd4a17f65006a2e3f39..3df889ecdaf2ec0c0ed0d0b0a8a86ad0c474b07c 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 46cdb80c86332058bda9ceb8a9709451a24a3edf..9988950a6e55500e911e9205f08bf1fe06b966df 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 babfe84ddcaaa777fe71b5031005e0677ae210c8..4aaf5e30f8dbfbc9e61edff003284045e65d2279 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 939143c4cbc48648af3078e2b8772143071737ee..6c9c6b3749e9b0a2b127e34218ac3bd73bfa54dd 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 abb8df2141ac33a2f63e06a05243e306fdd62257..f1b28d352e7e34d56cbab43b39fed792063dd22d 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 1d09ed42a572d553e8a0d2e198949dc44a48d1d9..fac2a5af09c171d37ff04e43176c46834e2f42df 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 2acd3cc12f27e76749afd8bc2c02b7957805bc98..4ac8f9c64a847a1455b059bbced463db4f7be327 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 909ba563270ac5e0f70d566e65c9a06a20fbc28c..dffbefd5fe4cd1b0af5ac9737aff243cf3c47aba 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 a78f84e5e6496b3aa450f5e36b30f0363da2057d..e5e9a28a92df18496ac59daa9371c95f3a3a6bb4 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 111839ccf932073e78b7e9af99acd3d08521cf96..857addfb38658a80f344a75d7526f8c5a1cc5ba0 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 acb6deaae67057c329f4278c13177fb36417b119..da76230ad5df5d09ddd0c98e1710efd8fd481d5a 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 13d60e6f7b4d77dddaa42dfe03c963f21304f504..a1d0376a4fa5a1cb6d3da285600bf724a7a8d148 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.
 #