diff --git a/akka-actor/src/main/scala/akka/routing/Pool.scala b/akka-actor/src/main/scala/akka/routing/Pool.scala
index 30a70fb2bc..98b4e57473 100644
--- a/akka-actor/src/main/scala/akka/routing/Pool.scala
+++ b/akka-actor/src/main/scala/akka/routing/Pool.scala
@@ -73,7 +73,7 @@ trait DefaultActorPool extends ActorPool { this: Actor =>
           case None =>
             delegate ! msg
           case Some(future) =>
-            future completeWith (delegate.!!!(msg, TimeUnit.NANOSECONDS.toMillis(future.timeoutInNanos)))
+            delegate.!!!(msg, TimeUnit.NANOSECONDS.toMillis(future.timeoutInNanos)).onComplete( future.completeWith(_) )
         }
       }
   }