diff --git a/akka-actor-tests/src/test/scala/akka/actor/actor/HotSwapSpec.scala b/akka-actor-tests/src/test/scala/akka/actor/actor/HotSwapSpec.scala
index eb020eebac..6cb1da93e8 100644
--- a/akka-actor-tests/src/test/scala/akka/actor/actor/HotSwapSpec.scala
+++ b/akka-actor-tests/src/test/scala/akka/actor/actor/HotSwapSpec.scala
@@ -119,7 +119,7 @@ class HotSwapSpec extends WordSpec with MustMatchers {
                 _log += "swapped"
                 barrier.await
               case "revert" =>
-                unbecome
+                unbecome()
             })
             barrier.await
         }
diff --git a/akka-actor/src/main/scala/akka/actor/Actor.scala b/akka-actor/src/main/scala/akka/actor/Actor.scala
index 6adbdffe2e..ee3c48374f 100644
--- a/akka-actor/src/main/scala/akka/actor/Actor.scala
+++ b/akka-actor/src/main/scala/akka/actor/Actor.scala
@@ -422,7 +422,7 @@ trait Actor {
    * If "discardOld" is true, an unbecome will be issued prior to pushing the new behavior to the stack
    */
   def become(behavior: Receive, discardOld: Boolean = true) {
-    if (discardOld) unbecome
+    if (discardOld) unbecome()
     self.hotswap = self.hotswap.push(behavior)
   }
 
@@ -454,7 +454,7 @@ trait Actor {
 
   private final def autoReceiveMessage(msg: AutoReceivedMessage): Unit = msg match {
     case HotSwap(code, discardOld) => become(code(self), discardOld)
-    case RevertHotSwap             => unbecome
+    case RevertHotSwap             => unbecome()
     case Exit(dead, reason)        => self.handleTrapExit(dead, reason)
     case Link(child)               => self.link(child)
     case Unlink(child)             => self.unlink(child)
diff --git a/akka-docs/pending/actors-scala.rst b/akka-docs/pending/actors-scala.rst
index 75e5b91f75..fc456ba71e 100644
--- a/akka-docs/pending/actors-scala.rst
+++ b/akka-docs/pending/actors-scala.rst
@@ -473,7 +473,7 @@ Here is another little cute example of ``become`` and ``unbecome`` in action:
        become {
          case Swap =>
            println("Ho")
-           unbecome // resets the latest 'become' (just for fun)
+           unbecome() // resets the latest 'become' (just for fun)
        }
    }
   }
@@ -511,7 +511,7 @@ Revert the Actor body using the ``unbecome`` method:
 .. code-block:: scala
 
   def receive: Receive = {
-    case "revert" => unbecome
+    case "revert" => unbecome()
   }
 
 Killing an Actor