diff --git a/sky/tools/big_red_button.py b/sky/tools/big_red_button.py
index 8b92020cdd6d04dcbd0d6db0d78d91a07968f53c..182b0091726af2292dc06c1044160d8cd7c00432 100755
--- a/sky/tools/big_red_button.py
+++ b/sky/tools/big_red_button.py
@@ -82,7 +82,7 @@ def main():
 
     run(sky_engine_root, ['git', 'pull', '--rebase'])
     run(sky_engine_root, ['gclient', 'sync'])
-    run(sky_engine_root, ['sky/tools/gn', 'gn', '--android', '--release'])
+    run(sky_engine_root, ['sky/tools/gn', '--android', '--release'])
     # TODO(eseidel): We shouldn't use mojob anymore, it likely will break.
     run(sky_engine_root, ['mojo/tools/mojob.py', 'build', '--android', '--release'])
     # Run tests?
diff --git a/sky/tools/gn b/sky/tools/gn
index 40986c70b45e941813388d078d3444d95f0079b9..c5be76058b383d9d5fbb5dcbd9cd73dc7c0ae0ba 100755
--- a/sky/tools/gn
+++ b/sky/tools/gn
@@ -58,6 +58,7 @@ def to_gn_args(args):
 def main():
   parser = argparse.ArgumentParser(description='A script run` gn gen`.')
   parser.add_argument('--debug', default=True)
+  parser.add_argument('--release', default=False, dest='debug', action='store_false')
   parser.add_argument('--target-os', type=str)
   parser.add_argument('--android', dest='target_os', action='store_const', const='android')
   parser.add_argument('--ios', dest='target_os', action='store_const', const='ios')