diff --git a/akka-distributed-data/src/main/mima-filters/2.6.5.backwards.excludes/pr-29041-immutable-cancellable.excludes b/akka-distributed-data/src/main/mima-filters/2.6.5.backwards.excludes/pr-29041-immutable-cancellable.excludes
new file mode 100644
index 0000000000..ffa12fe001
--- /dev/null
+++ b/akka-distributed-data/src/main/mima-filters/2.6.5.backwards.excludes/pr-29041-immutable-cancellable.excludes
@@ -0,0 +1,6 @@
+# Change internal methods of the Replicator actor
+ProblemFilters.exclude[DirectMissingMethodProblem]("akka.cluster.ddata.ReadWriteAggregator.sendToSecondarySchedule")
+ProblemFilters.exclude[DirectMissingMethodProblem]("akka.cluster.ddata.ReadWriteAggregator.sendToSecondarySchedule_=")
+ProblemFilters.exclude[DirectMissingMethodProblem]("akka.cluster.ddata.ReadWriteAggregator.timeoutSchedule")
+ProblemFilters.exclude[DirectMissingMethodProblem]("akka.cluster.ddata.ReadWriteAggregator.timeoutSchedule_=")
+
diff --git a/akka-distributed-data/src/main/scala/akka/cluster/ddata/Replicator.scala b/akka-distributed-data/src/main/scala/akka/cluster/ddata/Replicator.scala
index 21879dc47a..8cbfa04501 100644
--- a/akka-distributed-data/src/main/scala/akka/cluster/ddata/Replicator.scala
+++ b/akka-distributed-data/src/main/scala/akka/cluster/ddata/Replicator.scala
@@ -2369,8 +2369,8 @@ final class Replicator(settings: ReplicatorSettings) extends Actor with ActorLog
   def shuffle: Boolean
 
   import context.dispatcher
-  var sendToSecondarySchedule = context.system.scheduler.scheduleOnce(timeout / 5, self, SendToSecondary)
-  var timeoutSchedule = context.system.scheduler.scheduleOnce(timeout, self, ReceiveTimeout)
+  private val sendToSecondarySchedule = context.system.scheduler.scheduleOnce(timeout / 5, self, SendToSecondary)
+  private val timeoutSchedule = context.system.scheduler.scheduleOnce(timeout, self, ReceiveTimeout)
 
   var remaining = nodes.iterator.map(_.address).toSet