diff --git a/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment_unittest.py b/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment_unittest.py
index f5240f8696..c0f3d0e2a7 100644
--- a/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment_unittest.py
+++ b/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment_unittest.py
@@ -9,14 +9,9 @@
 """Unit tests for the apm_quality_assessment module.
 """
 
-import os
 import sys
 import unittest
 
-SRC = os.path.abspath(os.path.join(
-    os.path.dirname((__file__)), os.pardir, os.pardir, os.pardir))
-sys.path.append(os.path.join(SRC, 'third_party', 'pymock'))
-
 import mock
 
 import apm_quality_assessment
diff --git a/modules/audio_processing/test/py_quality_assessment/quality_assessment/input_mixer_unittest.py b/modules/audio_processing/test/py_quality_assessment/quality_assessment/input_mixer_unittest.py
index b212614199..87257e2fc9 100644
--- a/modules/audio_processing/test/py_quality_assessment/quality_assessment/input_mixer_unittest.py
+++ b/modules/audio_processing/test/py_quality_assessment/quality_assessment/input_mixer_unittest.py
@@ -12,14 +12,9 @@
 import logging
 import os
 import shutil
-import sys
 import tempfile
 import unittest
 
-SRC = os.path.abspath(os.path.join(
-    os.path.dirname((__file__)), os.pardir, os.pardir, os.pardir, os.pardir))
-sys.path.append(os.path.join(SRC, 'third_party', 'pymock'))
-
 import mock
 
 from . import exceptions
diff --git a/modules/audio_processing/test/py_quality_assessment/quality_assessment/simulation_unittest.py b/modules/audio_processing/test/py_quality_assessment/quality_assessment/simulation_unittest.py
index c39b12dd00..7d9ad6ca79 100644
--- a/modules/audio_processing/test/py_quality_assessment/quality_assessment/simulation_unittest.py
+++ b/modules/audio_processing/test/py_quality_assessment/quality_assessment/simulation_unittest.py
@@ -12,14 +12,9 @@
 import logging
 import os
 import shutil
-import sys
 import tempfile
 import unittest
 
-SRC = os.path.abspath(os.path.join(
-    os.path.dirname((__file__)), os.pardir, os.pardir, os.pardir, os.pardir))
-sys.path.append(os.path.join(SRC, 'third_party', 'pymock'))
-
 import mock
 import pydub
 
diff --git a/tools_webrtc/autoroller/unittests/roll_deps_test.py b/tools_webrtc/autoroller/unittests/roll_deps_test.py
index 8d68bddc35..8f6d57efea 100755
--- a/tools_webrtc/autoroller/unittests/roll_deps_test.py
+++ b/tools_webrtc/autoroller/unittests/roll_deps_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython
 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
@@ -24,8 +24,6 @@ from roll_deps import CalculateChangedDeps, FindAddedDeps, \
   GetMatchingDepsEntries, ParseDepsDict, ParseLocalDepsFile, UpdateDepsFile, \
   ChromiumRevisionUpdate
 
-SRC_DIR = os.path.join(PARENT_DIR, os.pardir, os.pardir)
-sys.path.append(os.path.join(SRC_DIR, 'third_party', 'pymock'))
 import mock
 
 TEST_DATA_VARS = {
diff --git a/tools_webrtc/libs/generate_licenses_test.py b/tools_webrtc/libs/generate_licenses_test.py
index 03f14459c2..fa05eaa12f 100755
--- a/tools_webrtc/libs/generate_licenses_test.py
+++ b/tools_webrtc/libs/generate_licenses_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython
 # pylint: disable=relative-import,protected-access,unused-argument
 
 #  Copyright 2017 The WebRTC project authors. All Rights Reserved.
@@ -9,13 +9,6 @@
 #  in the file PATENTS.  All contributing project authors may
 #  be found in the AUTHORS file in the root of the source tree.
 
-import os
-import sys
-
-SRC = os.path.abspath(
-    os.path.join(os.path.dirname((__file__)), os.pardir, os.pardir))
-sys.path.append(os.path.join(SRC, 'third_party', 'pymock'))
-
 import unittest
 import mock