diff --git a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/InternalMessage.scala b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/InternalMessage.scala
index 8b92de88ea..1fe691ffa4 100644
--- a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/InternalMessage.scala
+++ b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/InternalMessage.scala
@@ -9,7 +9,7 @@ import akka.annotation.InternalApi
 /**
  * A marker trait for internal messages.
  */
-@InternalApi sealed trait InternalMessage
+@InternalApi private[akka] sealed trait InternalMessage
 
 /**
  * INTERNAL API: Wrapping of messages that should be adapted by