diff --git a/akka-samples/akka-sample-cluster/src/main/scala/sample/cluster/transformation/TransformationSample.scala b/akka-samples/akka-sample-cluster/src/main/scala/sample/cluster/transformation/TransformationSample.scala
index 5deb2d4a40..159e17f94b 100644
--- a/akka-samples/akka-sample-cluster/src/main/scala/sample/cluster/transformation/TransformationSample.scala
+++ b/akka-samples/akka-sample-cluster/src/main/scala/sample/cluster/transformation/TransformationSample.scala
@@ -68,7 +68,8 @@ class TransformationFrontend extends Actor {
       context watch sender
       backends = backends :+ sender
 
-    case Terminated(a) ⇒ backends.filterNot(_ == a)
+    case Terminated(a) ⇒
+      backends = backends.filterNot(_ == a)
   }
 }
 //#frontend