diff --git a/gn b/gn
index 93c16e1d6f..6ae3065a36 100755
--- a/gn
+++ b/gn
@@ -5,4 +5,4 @@
 
 base_dir=$(dirname "$0")
 
-PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/gn.py" "$@"
+PYTHONDONTWRITEBYTECODE=1 exec python3 "$base_dir/gn.py" "$@"
diff --git a/gn.bat b/gn.bat
index 9eb6b56a1f..7403bfb57e 100644
--- a/gn.bat
+++ b/gn.bat
@@ -9,4 +9,4 @@ setlocal
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-python "%~dp0\gn.py" %*
+python3 "%~dp0\gn.py" %*
diff --git a/gn.py b/gn.py
index 43b18dd009..52d892dba9 100755
--- a/gn.py
+++ b/gn.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2013 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.