diff --git a/project/build/AkkaProject.scala b/project/build/AkkaProject.scala
index 0c3466f259..621c945653 100644
--- a/project/build/AkkaProject.scala
+++ b/project/build/AkkaProject.scala
@@ -19,7 +19,7 @@ class AkkaParentProject(info: ProjectInfo) extends DefaultProject(info) {
   val scalaCompileSettings =
     Seq("-deprecation",
         "-Xmigration",
-        //"-optimise",
+        "-optimise",
         "-encoding", "utf8")
 
   val javaCompileSettings = Seq("-Xlint:unchecked")