diff --git a/akka-actor/src/main/scala/akka/dispatch/sysmsg/SystemMessage.scala b/akka-actor/src/main/scala/akka/dispatch/sysmsg/SystemMessage.scala
index 5e73fcbee0..15aee48fc9 100644
--- a/akka-actor/src/main/scala/akka/dispatch/sysmsg/SystemMessage.scala
+++ b/akka-actor/src/main/scala/akka/dispatch/sysmsg/SystemMessage.scala
@@ -193,9 +193,15 @@ private[akka] sealed trait SystemMessage extends PossiblyHarmful with Serializab
   def unlinked: Boolean = next eq null
 }
 
-trait StashWhenWaitingForChildren
+/**
+ * INTERNAL API
+ */
+private[akka] trait StashWhenWaitingForChildren
 
-trait StashWhenFailed
+/**
+ * INTERNAL API
+ */
+private[akka] trait StashWhenFailed
 
 /**
  * INTERNAL API