diff --git a/tools/setup.py b/tools/setup.py
index 84bd0aba45..20271f4b3e 100755
--- a/tools/setup.py
+++ b/tools/setup.py
@@ -7,6 +7,7 @@ import distutils.spawn
 third_party.fix_symlinks()
 third_party.download_gn()
 third_party.download_clang()
+third_party.maybe_download_sysroot()
 
 
 def get_gn_args():
diff --git a/tools/third_party.py b/tools/third_party.py
index b756e1fa35..2a2c342311 100644
--- a/tools/third_party.py
+++ b/tools/third_party.py
@@ -166,3 +166,13 @@ def download_clang():
     run(['python',
          tp('v8/tools/clang/scripts/update.py'), '--if-needed'],
         env=google_env())
+
+
+def maybe_download_sysroot():
+    if sys.platform.startswith('linux'):
+        run([
+            'python',
+            tp('v8/build/linux/sysroot_scripts/install-sysroot.py'),
+            '--arch=amd64'
+        ],
+            env=google_env())