diff --git a/akka-actor-tests/src/test/scala/akka/actor/FSMActorSpec.scala b/akka-actor-tests/src/test/scala/akka/actor/FSMActorSpec.scala
index a89c6a931e..907947fe61 100644
--- a/akka-actor-tests/src/test/scala/akka/actor/FSMActorSpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/actor/FSMActorSpec.scala
@@ -91,7 +91,7 @@ object FSMActorSpec {
     }
 
     // initialize the lock
-    initialize
+    initialize()
 
     private def doLock() {
       lockedLatch.open
diff --git a/akka-actor-tests/src/test/scala/akka/actor/FSMTransitionSpec.scala b/akka-actor-tests/src/test/scala/akka/actor/FSMTransitionSpec.scala
index 783efc8f1f..c15da0cd00 100644
--- a/akka-actor-tests/src/test/scala/akka/actor/FSMTransitionSpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/actor/FSMTransitionSpec.scala
@@ -25,7 +25,7 @@ object FSMTransitionSpec {
     whenUnhandled {
       case Event("reply", _) ⇒ stay replying "reply"
     }
-    initialize
+    initialize()
     override def preRestart(reason: Throwable, msg: Option[Any]) { target ! "restarted" }
   }
 
diff --git a/akka-actor-tests/src/test/scala/akka/actor/SupervisorHierarchySpec.scala b/akka-actor-tests/src/test/scala/akka/actor/SupervisorHierarchySpec.scala
index f2a937112a..b4e8840b0e 100644
--- a/akka-actor-tests/src/test/scala/akka/actor/SupervisorHierarchySpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/actor/SupervisorHierarchySpec.scala
@@ -698,8 +698,7 @@ object SupervisorHierarchySpec {
         stop
     }
 
-    initialize
-
+    initialize()
   }
 
 }
diff --git a/akka-actor/src/main/scala/akka/actor/FSM.scala b/akka-actor/src/main/scala/akka/actor/FSM.scala
index ad70be0a0f..99f75dbaea 100644
--- a/akka-actor/src/main/scala/akka/actor/FSM.scala
+++ b/akka-actor/src/main/scala/akka/actor/FSM.scala
@@ -451,7 +451,7 @@ trait FSM[S, D] extends Listeners with ActorLogging {
    * Verify existence of initial state and setup timers. This should be the
    * last call within the constructor.
    */
-  final def initialize: Unit = makeTransition(currentState)
+  final def initialize(): Unit = makeTransition(currentState)
 
   /**
    * Return current state name (i.e. object of type S)
diff --git a/akka-contrib/src/main/scala/akka/contrib/throttle/TimerBasedThrottler.scala b/akka-contrib/src/main/scala/akka/contrib/throttle/TimerBasedThrottler.scala
index 3e1d2c6908..01003aff3d 100644
--- a/akka-contrib/src/main/scala/akka/contrib/throttle/TimerBasedThrottler.scala
+++ b/akka-contrib/src/main/scala/akka/contrib/throttle/TimerBasedThrottler.scala
@@ -276,7 +276,7 @@ class TimerBasedThrottler(var rate: Rate) extends Actor with Throttler with FSM[
     case Active -> Idle ⇒ stopTimer()
   }
 
-  initialize
+  initialize()
 
   private def startTimer(rate: Rate) = setTimer("morePermits", Tick, rate.duration, true)
   private def stopTimer() = cancelTimer("morePermits")
diff --git a/akka-docs/rst/scala/code/docs/actor/FSMDocSpec.scala b/akka-docs/rst/scala/code/docs/actor/FSMDocSpec.scala
index 4ce3ac07a6..59c62e93b9 100644
--- a/akka-docs/rst/scala/code/docs/actor/FSMDocSpec.scala
+++ b/akka-docs/rst/scala/code/docs/actor/FSMDocSpec.scala
@@ -81,7 +81,7 @@ class FSMDocSpec extends MyFavoriteTestFrameWorkPlusAkkaTestKit {
       //#unhandled-elided
       //#fsm-body
 
-      initialize
+      initialize()
     }
     //#simple-fsm
     object DemoCode {
diff --git a/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Conductor.scala b/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Conductor.scala
index 512881a4fd..392b7f5925 100644
--- a/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Conductor.scala
+++ b/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Conductor.scala
@@ -336,7 +336,7 @@ private[akka] class ServerFSM(val controller: ActorRef, val channel: Channel) ex
       stay
   }
 
-  initialize
+  initialize()
 }
 
 /**
@@ -574,7 +574,7 @@ private[akka] class BarrierCoordinator extends Actor with LoggingFSM[BarrierCoor
       throw BarrierTimeout(d)
   }
 
-  initialize
+  initialize()
 
   def handleBarrier(data: Data): State = {
     log.debug("handleBarrier({})", data)
diff --git a/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Player.scala b/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Player.scala
index 384d8cad38..57e636e6f1 100644
--- a/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Player.scala
+++ b/akka-multi-node-testkit/src/main/scala/akka/remote/testconductor/Player.scala
@@ -257,8 +257,7 @@ private[akka] class ClientFSM(name: RoleName, controllerAddr: InetSocketAddress)
       channel.close()
   }
 
-  initialize
-
+  initialize()
 }
 
 /**
diff --git a/akka-samples/akka-sample-fsm/src/main/scala/Buncher.scala b/akka-samples/akka-sample-fsm/src/main/scala/Buncher.scala
index 8ebaa4a2e9..b773f316d4 100644
--- a/akka-samples/akka-sample-fsm/src/main/scala/Buncher.scala
+++ b/akka-samples/akka-sample-fsm/src/main/scala/Buncher.scala
@@ -76,7 +76,7 @@ abstract class GenericBuncher[A: ClassTag, B](val singleTimeout: FiniteDuration,
       stop
   }
 
-  initialize
+  initialize()
 }
 
 object Buncher {
diff --git a/akka-samples/akka-sample-fsm/src/main/scala/DiningHakkersOnFsm.scala b/akka-samples/akka-sample-fsm/src/main/scala/DiningHakkersOnFsm.scala
index f7bb9e6bd7..4e257350c4 100644
--- a/akka-samples/akka-sample-fsm/src/main/scala/DiningHakkersOnFsm.scala
+++ b/akka-samples/akka-sample-fsm/src/main/scala/DiningHakkersOnFsm.scala
@@ -55,7 +55,7 @@ class Chopstick extends Actor with FSM[ChopstickState, TakenBy] {
   }
 
   // Initialze the chopstick
-  initialize
+  initialize()
 }
 
 /**
@@ -155,7 +155,7 @@ class FSMHakker(name: String, left: ActorRef, right: ActorRef) extends Actor wit
   }
 
   // Initialize the hakker
-  initialize
+  initialize()
 
   private def startThinking(duration: FiniteDuration): State = {
     goto(Thinking) using TakenChopsticks(None, None) forMax duration