diff --git a/akka-cluster/src/multi-jvm/scala/akka/cluster/StressSpec.scala b/akka-cluster/src/multi-jvm/scala/akka/cluster/StressSpec.scala
index affb22247c..c8824108e6 100644
--- a/akka-cluster/src/multi-jvm/scala/akka/cluster/StressSpec.scala
+++ b/akka-cluster/src/multi-jvm/scala/akka/cluster/StressSpec.scala
@@ -941,7 +941,7 @@ abstract class StressSpec
 
   "A cluster under stress" must {
 
-    "join seed nodes" taggedAs LongRunningTest in within(20 seconds) {
+    "join seed nodes" taggedAs LongRunningTest in within(30 seconds) {
 
       val otherNodesJoiningSeedNodes = roles.slice(numberOfSeedNodes, numberOfSeedNodes + numberOfNodesJoiningToSeedNodesInitially)
       val size = seedNodes.size + otherNodesJoiningSeedNodes.size