diff --git a/cast/script/upload b/cast/script/upload
index 95f46032cf..fc22529ceb 100755
--- a/cast/script/upload
+++ b/cast/script/upload
@@ -1,3 +1,5 @@
 # Run it twice, second time we just delete.
 aws s3 sync dist s3://cast.home-assistant.io --acl public-read
-aws s3 sync dist s3://cast.home-assistant.io --acl public-read --delete
+# Don't delete as it might break open sites that need to load code splitted things.
+# aws s3 sync dist s3://cast.home-assistant.io --acl public-read --delete
+# Todo : update JS first, HTML last.