diff --git a/actor/src/main/scala-jdk-9/org/apache/pekko/dispatch/PekkoJdk9ForkJoinPool.scala b/actor/src/main/scala-jdk-9/org/apache/pekko/dispatch/PekkoJdk9ForkJoinPool.scala
index 917b3e6adc5..a115a8e063e 100644
--- a/actor/src/main/scala-jdk-9/org/apache/pekko/dispatch/PekkoJdk9ForkJoinPool.scala
+++ b/actor/src/main/scala-jdk-9/org/apache/pekko/dispatch/PekkoJdk9ForkJoinPool.scala
@@ -36,7 +36,7 @@ private[dispatch] final class PekkoJdk9ForkJoinPool(
     unhandledExceptionHandler: Thread.UncaughtExceptionHandler,
     asyncMode: Boolean)
     extends ForkJoinPool(parallelism, threadFactory, unhandledExceptionHandler, asyncMode,
-      0, maximumPoolSize, 1, null, ForkJoinPoolConstants.DefaultKeepAlive, TimeUnit.MILLISECONDS)
+      0, maximumPoolSize, 1, null, ForkJoinPoolConstants.DefaultKeepAliveMillis, TimeUnit.MILLISECONDS)
     with LoadMetrics {
 
   override def execute(r: Runnable): Unit =
diff --git a/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinExecutorConfigurator.scala b/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinExecutorConfigurator.scala
index 65e8dff6641..71d2ffc750b 100644
--- a/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinExecutorConfigurator.scala
+++ b/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinExecutorConfigurator.scala
@@ -19,6 +19,8 @@ import java.lang.invoke.{ MethodHandle, MethodHandles, MethodType }
 import java.util.concurrent.{ ExecutorService, ForkJoinPool, ForkJoinTask, ThreadFactory }
 import scala.util.Try
 
+import org.apache.pekko.util.JavaVersion
+
 object ForkJoinExecutorConfigurator {
 
   /**
@@ -98,12 +100,16 @@ class ForkJoinExecutorConfigurator(config: Config, prerequisites: DispatcherPrer
       Try(Class.forName("org.apache.pekko.dispatch.PekkoJdk9ForkJoinPool")).toOption
 
     private lazy val pekkoJdk9ForkJoinPoolHandleOpt: Option[MethodHandle] = {
-      pekkoJdk9ForkJoinPoolClassOpt.map { clz =>
-        val methodHandleLookup = MethodHandles.lookup()
-        val mt = MethodType.methodType(classOf[Unit], classOf[Int],
-          classOf[ForkJoinPool.ForkJoinWorkerThreadFactory],
-          classOf[Int], classOf[Thread.UncaughtExceptionHandler], classOf[Boolean])
-        methodHandleLookup.findConstructor(clz, mt)
+      if (JavaVersion.majorVersion == 8) {
+        None
+      } else {
+        pekkoJdk9ForkJoinPoolClassOpt.map { clz =>
+          val methodHandleLookup = MethodHandles.lookup()
+          val mt = MethodType.methodType(classOf[Unit], classOf[Int],
+            classOf[ForkJoinPool.ForkJoinWorkerThreadFactory],
+            classOf[Int], classOf[Thread.UncaughtExceptionHandler], classOf[Boolean])
+          methodHandleLookup.findConstructor(clz, mt)
+        }
       }
     }
 
diff --git a/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinPoolConstants.scala b/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinPoolConstants.scala
index 7643c2d2deb..f7235f608d0 100644
--- a/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinPoolConstants.scala
+++ b/actor/src/main/scala/org/apache/pekko/dispatch/ForkJoinPoolConstants.scala
@@ -19,5 +19,5 @@ package org.apache.pekko.dispatch
 
 private[dispatch] object ForkJoinPoolConstants {
   final val MaxCap: Int = 0x7FFF // 32767
-  final val DefaultKeepAlive: Long = 60000
+  final val DefaultKeepAliveMillis: Long = 60000
 }