diff --git a/fetch b/fetch
index fd28305258..96e984a3ef 100755
--- a/fetch
+++ b/fetch
@@ -10,7 +10,12 @@ base_dir=$(dirname "$0")
 PATH=$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" "$@"
 else
+  # Run on Python 2 for now, allows default to be flipped.
   PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/fetch.py" "$@"
 fi
diff --git a/gclient b/gclient
index 453e06562b..1dfb7f6c19 100755
--- a/gclient
+++ b/gclient
@@ -27,7 +27,12 @@ fi
 PATH=$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" "$@"
 else
-  PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/gclient.py" "$@"
+  # Run on Python 2 for now, allows default to be flipped.
+  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/gclient.py" "$@"
 fi