diff --git a/akka-cluster-tools/src/main/scala/akka/cluster/singleton/ClusterSingletonManager.scala b/akka-cluster-tools/src/main/scala/akka/cluster/singleton/ClusterSingletonManager.scala
index 70dc6f22d1..b52952ef39 100644
--- a/akka-cluster-tools/src/main/scala/akka/cluster/singleton/ClusterSingletonManager.scala
+++ b/akka-cluster-tools/src/main/scala/akka/cluster/singleton/ClusterSingletonManager.scala
@@ -522,7 +522,7 @@ class ClusterSingletonManager(singletonProps: Props, terminationMessage: Any, se
     (handOverRetries, takeOverRetries)
   }
 
-  // started when when self member is Up
+  // started when self member is Up
   var oldestChangedBuffer: ActorRef = _
   // Previous GetNext request delivered event and new GetNext is to be sent
   var oldestChangedReceived = true