diff --git a/apply_issue.bat b/apply_issue.bat
index 2a035062b3..30bc306bcf 100755
--- a/apply_issue.bat
+++ b/apply_issue.bat
@@ -4,5 +4,9 @@
 :: found in the LICENSE file.
 setlocal
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-%~dp0python "%~dp0\apply_issue.py" %*
+python "%~dp0\apply_issue.py" %*
diff --git a/cit.bat b/cit.bat
index 8f79044aaf..82919b936d 100755
--- a/cit.bat
+++ b/cit.bat
@@ -1,8 +1,12 @@
-@echo off
-:: Copyright (c) 2015 The Chromium Authors. All rights reserved.
-:: Use of this source code is governed by a BSD-style license that can be
-:: found in the LICENSE file.
-setlocal
-
-:: Defer control.
-%~dp0python "%~dp0\cit.py" %*
+@echo off
+:: Copyright (c) 2015 The Chromium Authors. All rights reserved.
+:: Use of this source code is governed by a BSD-style license that can be
+:: found in the LICENSE file.
+setlocal
+
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
+:: Defer control.
+python "%~dp0\cit.py" %*
diff --git a/clang-format.bat b/clang-format.bat
index 884cd246a3..c3bb53bc44 100644
--- a/clang-format.bat
+++ b/clang-format.bat
@@ -4,5 +4,9 @@
 :: found in the LICENSE file.
 setlocal
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-%~dp0python "%~dp0\clang_format.py" %*
+python "%~dp0\clang_format.py" %*
diff --git a/clang_format_merge_driver.bat b/clang_format_merge_driver.bat
index 6f15dd749c..8e614b492d 100755
--- a/clang_format_merge_driver.bat
+++ b/clang_format_merge_driver.bat
@@ -1,8 +1,12 @@
-@echo off
-:: Copyright 2016 The Chromium Authors. All rights reserved.
-:: Use of this source code is governed by a BSD-style license that can be
-:: found in the LICENSE file.
-setlocal
-
-:: Defer control.
-%~dp0python "%~dp0\clang_format_merge_driver.py" %*
+@echo off
+:: Copyright 2016 The Chromium Authors. All rights reserved.
+:: Use of this source code is governed by a BSD-style license that can be
+:: found in the LICENSE file.
+setlocal
+
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
+:: Defer control.
+python "%~dp0\clang_format_merge_driver.py" %*
diff --git a/commit_queue.bat b/commit_queue.bat
index c1babf04cf..44639a64d8 100755
--- a/commit_queue.bat
+++ b/commit_queue.bat
@@ -4,5 +4,9 @@
 :: found in the LICENSE file.
 setlocal
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-%~dp0python "%~dp0\commit_queue.py" %*
+python "%~dp0\commit_queue.py" %*
diff --git a/cpplint.bat b/cpplint.bat
index 914eecf1a7..4b916c086b 100644
--- a/cpplint.bat
+++ b/cpplint.bat
@@ -1,4 +1,11 @@
 @echo off
+:: Copyright 2016 The Chromium Authors. All rights reserved.
+:: Use of this source code is governed by a BSD-style license that can be
+:: found in the LICENSE file.
 setlocal
 
-call python "%~dp0cpplint.py" %*
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
+python "%~dp0cpplint.py" %*
diff --git a/depot-tools-auth.bat b/depot-tools-auth.bat
index 4770ed6fb4..37280b765f 100644
--- a/depot-tools-auth.bat
+++ b/depot-tools-auth.bat
@@ -4,5 +4,9 @@
 :: found in the LICENSE file.
 setlocal
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-%~dp0python "%~dp0\depot-tools-auth.py" %*
+python "%~dp0\depot-tools-auth.py" %*
diff --git a/download_from_google_storage.bat b/download_from_google_storage.bat
index 4c7971b426..f1f2d21616 100755
--- a/download_from_google_storage.bat
+++ b/download_from_google_storage.bat
@@ -2,6 +2,11 @@
 :: Copyright (c) 2012 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
+
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
 
 :: Defer control.
-%~dp0python "%~dp0\download_from_google_storage.py" %*
+python "%~dp0\download_from_google_storage.py" %*
diff --git a/fetch.bat b/fetch.bat
index d6ea944e26..5f8019a19d 100755
--- a/fetch.bat
+++ b/fetch.bat
@@ -7,5 +7,9 @@ setlocal
 :: Synchronize the root directory before deferring control back to gclient.py.
 call "%~dp0\update_depot_tools.bat"
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-%~dp0python "%~dp0\fetch.py" %*
+python "%~dp0\fetch.py" %*
diff --git a/gclient.bat b/gclient.bat
index d66ce6a41a..5aaff866c5 100755
--- a/gclient.bat
+++ b/gclient.bat
@@ -7,5 +7,9 @@ setlocal
 :: Synchronize the root directory before deferring control back to gclient.py.
 call "%~dp0update_depot_tools.bat" %*
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-"%~dp0python" "%~dp0gclient.py" %*
+python "%~dp0gclient.py" %*
diff --git a/gn.bat b/gn.bat
index 0a42a0766e..9eb6b56a1f 100644
--- a/gn.bat
+++ b/gn.bat
@@ -4,5 +4,9 @@
 :: found in the LICENSE file.
 setlocal
 
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
 :: Defer control.
-%~dp0python "%~dp0\gn.py" %*
+python "%~dp0\gn.py" %*
diff --git a/roll-dep-svn.bat b/roll-dep-svn.bat
index b2aec795e8..6ff5db78f1 100755
--- a/roll-dep-svn.bat
+++ b/roll-dep-svn.bat
@@ -1,7 +1,12 @@
-@echo off
-:: Copyright (c) 2012 The Chromium Authors. All rights reserved.
-:: Use of this source code is governed by a BSD-style license that can be
-:: found in the LICENSE file.
-
-:: Defer control.
-%~dp0python "%~dp0\roll_dep_svn.py" %*
+@echo off
+:: Copyright (c) 2012 The Chromium Authors. All rights reserved.
+:: Use of this source code is governed by a BSD-style license that can be
+:: found in the LICENSE file.
+setlocal
+
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
+
+:: Defer control.
+python "%~dp0\roll_dep_svn.py" %*
diff --git a/roll-dep.bat b/roll-dep.bat
index d5166dfa8b..c49c88dc51 100755
--- a/roll-dep.bat
+++ b/roll-dep.bat
@@ -2,6 +2,11 @@
 :: Copyright (c) 2012 The Chromium Authors. All rights reserved.
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
+setlocal
+
+:: Ensure that "depot_tools" is somewhere in PATH so this tool can be used
+:: standalone, but allow other PATH manipulations to take priority.
+set PATH=%PATH%;%~dp0
 
 :: Defer control.
-%~dp0python "%~dp0\roll_dep.py" %*
+python "%~dp0\roll_dep.py" %*