diff --git a/akka-cluster/src/main/scala/akka/cluster/Cluster.scala b/akka-cluster/src/main/scala/akka/cluster/Cluster.scala
index 8646f45b4f..8a82143269 100644
--- a/akka-cluster/src/main/scala/akka/cluster/Cluster.scala
+++ b/akka-cluster/src/main/scala/akka/cluster/Cluster.scala
@@ -72,7 +72,7 @@ class Cluster(val system: ExtendedActorSystem) extends Extension {
     case c: ClusterActorRefProvider ⇒
       UniqueAddress(c.transport.defaultAddress, AddressUidExtension(system).longAddressUid)
     case other ⇒ throw new ConfigurationException(
-      s"ActorSystem [${system}] needs to have a 'ClusterActorRefProvider' enabled in the configuration, currently uses [${other.getClass.getName}]")
+      s"ActorSystem [${system}] needs to have 'akka.actor.provider' set to 'cluster' in the configuration, currently uses [${other.getClass.getName}]")
   }
 
   /**