diff --git a/akka-cluster/src/multi-jvm/scala/akka/cluster/MBeanSpec.scala b/akka-cluster/src/multi-jvm/scala/akka/cluster/MBeanSpec.scala
index 5c3fd3d5f6..ad8c41124a 100644
--- a/akka-cluster/src/multi-jvm/scala/akka/cluster/MBeanSpec.scala
+++ b/akka-cluster/src/multi-jvm/scala/akka/cluster/MBeanSpec.scala
@@ -95,7 +95,7 @@ abstract class MBeanSpec
       enterBarrier("after-4")
     }
 
-    "support down" taggedAs LongRunningTest in {
+    "support down" taggedAs LongRunningTest in within(20 seconds) {
       val fourthAddress = address(fourth)
       runOn(first) {
         testConductor.shutdown(fourth, 0).await