diff --git a/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/PersistentShardingMigrationSpec.scala b/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/PersistentShardingMigrationSpec.scala
index 23df1e3c60..47cf6ac63b 100644
--- a/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/PersistentShardingMigrationSpec.scala
+++ b/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/PersistentShardingMigrationSpec.scala
@@ -24,6 +24,7 @@ object PersistentShardingMigrationSpec {
        akka.loglevel = INFO
        akka.actor.provider = "cluster"
        akka.remote.artery.canonical.port = 0 
+       akka.remote.classic.netty.tcp.port = 0
        akka.cluster.sharding {
         remember-entities = on
         remember-entities-store = "eventsourced"
diff --git a/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/RememberEntitiesShardIdExtractorChangeSpec.scala b/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/RememberEntitiesShardIdExtractorChangeSpec.scala
index be2a5b9f60..78dfd950fe 100644
--- a/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/RememberEntitiesShardIdExtractorChangeSpec.scala
+++ b/akka-cluster-sharding/src/test/scala/akka/cluster/sharding/RememberEntitiesShardIdExtractorChangeSpec.scala
@@ -28,6 +28,7 @@ object RememberEntitiesShardIdExtractorChangeSpec {
        akka.loglevel = INFO
        akka.actor.provider = "cluster"
        akka.remote.artery.canonical.port = 0 
+       akka.remote.classic.netty.tcp.port = 0
        akka.cluster.sharding {
         remember-entities = on
         remember-entities-store = "eventsourced"