diff --git a/DEPS b/DEPS
index a5500f5..aa0527f 100644
--- a/DEPS
+++ b/DEPS
@@ -270,7 +270,8 @@
     'name': 'mac_toolchain',
     'pattern': '.',
     'condition': 'checkout_mac',
-    'action': ['python', 'build/mac_toolchain.py'],
+    'action': ['python', 'build/mac_toolchain.py',
+               '--xcode-version', Var('mac_xcode_version')],
   },
   # Pull clang-format binaries using checked-in hashes.
   {