diff --git a/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeaving.scala b/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeaving.scala
index a6ddccb806..058bfca7e9 100644
--- a/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeaving.scala
+++ b/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeaving.scala
@@ -18,7 +18,7 @@ object NodeLeavingMultiJvmSpec extends MultiNodeConfig {
   commonConfig(
     debugConfig(on = false)
     .withFallback(ConfigFactory.parseString("""
-        akka.cluster.unreachable-nodes-reaper-frequency = 30000 # turn "off" reaping to unreachable node set
+        akka.cluster.unreachable-nodes-reaper-frequency = 30 s # turn "off" reaping to unreachable node set
       """))
     .withFallback(MultiNodeClusterSpec.clusterConfig))
 }
diff --git a/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeavingAndExiting.scala b/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeavingAndExiting.scala
index 8a1815a5dd..f2032f28d3 100644
--- a/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeavingAndExiting.scala
+++ b/akka-cluster/src/multi-jvm/scala/akka/cluster/NodeLeavingAndExiting.scala
@@ -20,8 +20,8 @@ object NodeLeavingAndExitingMultiJvmSpec extends MultiNodeConfig {
     debugConfig(on = false)
     .withFallback(ConfigFactory.parseString("""
         akka.cluster {
-          leader-actions-frequency           = 5000 ms  # increase the leader action task frequency
-          unreachable-nodes-reaper-frequency = 30000 ms # turn "off" reaping to unreachable node set
+          leader-actions-frequency           = 5 s  # increase the leader action task frequency
+          unreachable-nodes-reaper-frequency = 30 s # turn "off" reaping to unreachable node set
         }
       """)
     .withFallback(MultiNodeClusterSpec.clusterConfig)))