diff --git a/lib/chrome_util.py b/lib/chrome_util.py
index a03b7a7..5a9b30b 100644
--- a/lib/chrome_util.py
+++ b/lib/chrome_util.py
@@ -359,6 +359,7 @@
   Path('nacl_irt_*.nexe',
        cond=C.GypNotSet(_DISABLE_NACL)),
   Path('nacl_helper',
+       exe=True,
        optional=True,
        cond=C.GypNotSet(_DISABLE_NACL)),
   Path('resources/'),