diff --git a/build-gn/commit_id.py b/build-gn/commit_id.py
index 78e978e..16af01a 100755
--- a/build-gn/commit_id.py
+++ b/build-gn/commit_id.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 # Copyright (C) 2018 The ANGLE Project Authors.
 #
diff --git a/build-gn/generate_vulkan_layers_json.py b/build-gn/generate_vulkan_layers_json.py
index 2999cd8..fd63478 100755
--- a/build-gn/generate_vulkan_layers_json.py
+++ b/build-gn/generate_vulkan_layers_json.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 # Copyright (C) 2016 The ANGLE Project Authors.
 #
diff --git a/build-gn/remove_files.py b/build-gn/remove_files.py
index 4bcc743..ba30527 100755
--- a/build-gn/remove_files.py
+++ b/build-gn/remove_files.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 # Copyright (C) 2019 The ANGLE Project Authors.
 #