diff --git a/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala b/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala
index 188be4e24..061daa52e 100644
--- a/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala
+++ b/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala
@@ -195,7 +195,7 @@ private[sbt] abstract class AbstractBackgroundJobService extends BackgroundJobSe
   override def shutdown(): Unit = {
     val deadline = 10.seconds.fromNow
     while (jobSet.nonEmpty && !deadline.isOverdue) {
-      jobSet.headOption.foreach { case handle: ThreadJobHandle @unchecked =>
+      jobSet.headOption.foreach { handle =>
         if (handle.job.isRunning()) {
           handle.job.shutdown()
           handle.job.awaitTerminationTry(10.seconds)