diff --git a/src/Lean/CoreM.lean b/src/Lean/CoreM.lean
index 3943c5dfae..bb1d011680 100644
--- a/src/Lean/CoreM.lean
+++ b/src/Lean/CoreM.lean
@@ -667,9 +667,9 @@ private def checkUnsupported [Monad m] [MonadEnv m] [MonadError m] (decl : Decla
     | _ => pure ()
 
 register_builtin_option compiler.enableNew : Bool := {
-  defValue := false
+  defValue := true
   group    := "compiler"
-  descr    := "(compiler) enable the new code generator, this should have no significant effect on your code but it does help to test the new code generator; unset to only use the old code generator instead"
+  descr    := "(compiler) enable the new code generator, unset to use the old code generator instead"
 }
 
 /--