diff --git a/project/MultiNode.scala b/project/MultiNode.scala
index 93b04aa757..59a9709e91 100644
--- a/project/MultiNode.scala
+++ b/project/MultiNode.scala
@@ -42,7 +42,7 @@ object MultiNode extends AutoPlugin {
     // -DMultiJvm.akka.cluster.Stress.nrOfNodes=15
     val MultinodeJvmArgs = "multinode\\.(D|X)(.*)".r
     val knownPrefix = Set("multnode.", "akka.", "MultiJvm.")
-    val akkaProperties = System.getProperties.propertyNames.asScala.toList.collect {
+    val akkaProperties = System.getProperties.stringPropertyNames.asScala.toList.collect {
       case MultinodeJvmArgs(a, b) ⇒
         val value = System.getProperty("multinode." + a + b)
         "-" + a + b + (if (value == "") "" else "=" + value)