diff --git a/fetch b/fetch
index ca617e50c..4f0065b3d 100755
--- a/fetch
+++ b/fetch
@@ -15,9 +15,6 @@ if [[ $GCLIENT_PY3 == 1 ]]; then
 elif [[ $GCLIENT_PY3 == 0 ]]; then
   # Explicitly run on Python 2
   PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/fetch.py" "$@"
-elif [[ $(uname -s) = MINGW* || $(uname -s) = CYGWIN* ]]; then
-  # Run on Python 2 on Windows for now, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/fetch.py" "$@"
 else
   # Run on Python 3, allows default to be flipped.
   PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"
diff --git a/fetch.bat b/fetch.bat
index 6a2e74d21..8a3476521 100755
--- a/fetch.bat
+++ b/fetch.bat
@@ -19,6 +19,6 @@ IF "%GCLIENT_PY3%" == "1" (
   :: Explicitly run on Python 2
   call vpython "%~dp0\fetch.py" %*
 ) ELSE (
-  :: Run on Python 2, allows default to be flipped.
-  call vpython "%~dp0\fetch.py" %*
+  :: Run on Python 3, allows default to be flipped.
+  call vpython3 "%~dp0\fetch.py" %*
 )
diff --git a/gclient b/gclient
index 003e190bb..cb1d46787 100755
--- a/gclient
+++ b/gclient
@@ -32,9 +32,6 @@ if [[ $GCLIENT_PY3 == 1 ]]; then
 elif [[ $GCLIENT_PY3 == 0 ]]; then
   # Explicitly run on Python 2
   PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/gclient.py" "$@"
-elif [[ $(uname -s) = MINGW* || $(uname -s) = CYGWIN* ]]; then
-  # Run on Python 2 on Windows for now, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/gclient.py" "$@"
 else
   # Run on Python 3, allows default to be flipped.
   PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"
diff --git a/gclient.bat b/gclient.bat
index 7f72c31dc..d91adfbc0 100755
--- a/gclient.bat
+++ b/gclient.bat
@@ -23,6 +23,6 @@ IF "%GCLIENT_PY3%" == "1" (
   :: Explicitly run on Python 2
   call vpython "%~dp0gclient.py" %*
 ) ELSE (
-  :: Run on Python 2, allows default to be flipped.
-  call vpython "%~dp0gclient.py" %*
+  :: Run on Python 3, allows default to be flipped.
+  call vpython3 "%~dp0gclient.py" %*
 )
diff --git a/python_runner.sh b/python_runner.sh
index 60267281f..0e4a3dca6 100755
--- a/python_runner.sh
+++ b/python_runner.sh
@@ -54,9 +54,6 @@ if [[ $GCLIENT_PY3 = 1 ]]; then
 elif [[ $GCLIENT_PY3 = 0 ]]; then
   # Explicitly run on Python 2
   vpython "$DEPOT_TOOLS/$SCRIPT" "$@"
-elif [[ $(uname -s) = MINGW* || $(uname -s) = CYGWIN* ]]; then
-  # Run on Python 2 on Windows for now, allows default to be flipped.
-  vpython "$DEPOT_TOOLS/$SCRIPT" "$@"
 else
   # Run on Python 3, allows default to be flipped.
   vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"
diff --git a/roll-dep b/roll-dep
index cde993eda..6c0e6388c 100755
--- a/roll-dep
+++ b/roll-dep
@@ -15,9 +15,6 @@ if [[ $GCLIENT_PY3 = 1 ]]; then
 elif [[ $GCLIENT_PY3 = 0 ]]; then
   # Explicitly run on Python 2
   PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/roll_dep.py" "$@"
-elif [[ $(uname -s) = MINGW* || $(uname -s) = CYGWIN* ]]; then
-  # Run on Python 2 on Windows for now, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/roll_dep.py" "$@"
 else
   # Run on Python 2 for now, allows default to be flipped.
   PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
diff --git a/roll-dep.bat b/roll-dep.bat
index 0295fbd13..9ad5248a2 100755
--- a/roll-dep.bat
+++ b/roll-dep.bat
@@ -16,6 +16,6 @@ IF "%GCLIENT_PY3%" == "1" (
   :: Explicitly run on Python 2
   call vpython "%~dp0\roll_dep.py" %*
 ) ELSE (
-  :: Run on Python 2, allows default to be flipped.
-  call vpython "%~dp0\roll_dep.py" %*
+  :: Run on Python 3, allows default to be flipped.
+  call vpython3 "%~dp0\roll_dep.py" %*
 )