diff --git a/core/jack-default.args b/core/jack-default.args
index 0232301..433bc53 100644
--- a/core/jack-default.args
+++ b/core/jack-default.args
@@ -5,3 +5,5 @@
 -D jack.reporter.level.file=error=--,warning=-
 --verbose error
 -D jack.jayce.cache=false
+-D jack.lambda.grouping-scope=package
+-D jack.lambda.simplify-stateless=true