diff --git a/fetch b/fetch
index 4f0065b3d0..439fe77117 100755
--- a/fetch
+++ b/fetch
@@ -9,13 +9,4 @@ base_dir=$(dirname "$0")
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$base_dir
 
-if [[ $GCLIENT_PY3 == 1 ]]; then
-  # Explicitly run on Python 3
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"
-elif [[ $GCLIENT_PY3 == 0 ]]; then
-  # Explicitly run on Python 2
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/fetch.py" "$@"
-else
-  # Run on Python 3, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"
-fi
+PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"
diff --git a/fetch.bat b/fetch.bat
index 26d8bc130d..3eb7845354 100755
--- a/fetch.bat
+++ b/fetch.bat
@@ -16,13 +16,4 @@ IF %ERRORLEVEL% NEQ 0 (
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-IF "%GCLIENT_PY3%" == "1" (
-  :: Explicitly run on Python 3
-  call vpython3 "%~dp0\fetch.py" %*
-) ELSE IF "%GCLIENT_PY3%" == "0" (
-  :: Explicitly run on Python 2
-  call vpython "%~dp0\fetch.py" %*
-) ELSE (
-  :: Run on Python 3, allows default to be flipped.
-  call vpython3 "%~dp0\fetch.py" %*
-)
+call vpython3 "%~dp0\fetch.py" %*
diff --git a/gclient b/gclient
index 4ef5ab03b3..cd77c77d60 100755
--- a/gclient
+++ b/gclient
@@ -26,13 +26,4 @@ fi
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$base_dir
 
-if [[ $GCLIENT_PY3 == 1 ]]; then
-  # Explicitly run on Python 3
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"
-elif [[ $GCLIENT_PY3 == 0 ]]; then
-  # Explicitly run on Python 2
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/gclient.py" "$@"
-else
-  # Run on Python 3, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"
-fi
+PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"
diff --git a/gclient.bat b/gclient.bat
index 5a6ca1938c..d88a3186e2 100755
--- a/gclient.bat
+++ b/gclient.bat
@@ -20,13 +20,4 @@ IF %ERRORLEVEL% NEQ 0 (
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-IF "%GCLIENT_PY3%" == "1" (
-  :: Explicitly run on Python 3
-  call vpython3 "%~dp0gclient.py" %*
-) ELSE IF "%GCLIENT_PY3%" == "0" (
-  :: Explicitly run on Python 2
-  call vpython "%~dp0gclient.py" %*
-) ELSE (
-  :: Run on Python 3, allows default to be flipped.
-  call vpython3 "%~dp0gclient.py" %*
-)
+call vpython3 "%~dp0gclient.py" %*
diff --git a/python_runner.sh b/python_runner.sh
index 0e4a3dca6d..cf48c9a930 100755
--- a/python_runner.sh
+++ b/python_runner.sh
@@ -48,13 +48,4 @@ SCRIPT="${SCRIPT-${BASENAME//-/_}.py}"
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$DEPOT_TOOLS
 
-if [[ $GCLIENT_PY3 = 1 ]]; then
-  # Explicitly run on Python 3
-  vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"
-elif [[ $GCLIENT_PY3 = 0 ]]; then
-  # Explicitly run on Python 2
-  vpython "$DEPOT_TOOLS/$SCRIPT" "$@"
-else
-  # Run on Python 3, allows default to be flipped.
-  vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"
-fi
+vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"
diff --git a/roll-dep b/roll-dep
index 6c0e6388c2..663231e140 100755
--- a/roll-dep
+++ b/roll-dep
@@ -9,13 +9,4 @@ base_dir=$(dirname "$0")
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$base_dir
 
-if [[ $GCLIENT_PY3 = 1 ]]; then
-  # Explicitly run on Python 3
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
-elif [[ $GCLIENT_PY3 = 0 ]]; then
-  # Explicitly run on Python 2
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$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" "$@"
-fi
+PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
diff --git a/roll-dep.bat b/roll-dep.bat
index 9ad5248a29..75f689eaec 100755
--- a/roll-dep.bat
+++ b/roll-dep.bat
@@ -9,13 +9,4 @@ setlocal
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-IF "%GCLIENT_PY3%" == "1" (
-  :: Explicitly run on Python 3
-  call vpython3 "%~dp0\roll_dep.py" %*
-) ELSE IF "%GCLIENT_PY3%" == "0" (
-  :: Explicitly run on Python 2
-  call vpython "%~dp0\roll_dep.py" %*
-) ELSE (
-  :: Run on Python 3, allows default to be flipped.
-  call vpython3 "%~dp0\roll_dep.py" %*
-)
+call vpython3 "%~dp0\roll_dep.py" %*