diff --git a/main/src/main/scala/sbt/ClassLoaderLayeringStrategy.scala b/main/src/main/scala/sbt/ClassLoaderLayeringStrategy.scala
index 483900728..cfb360fc4 100644
--- a/main/src/main/scala/sbt/ClassLoaderLayeringStrategy.scala
+++ b/main/src/main/scala/sbt/ClassLoaderLayeringStrategy.scala
@@ -96,5 +96,5 @@ object ClassLoaderLayeringStrategy {
   /**
    * Add a layer on top of the ScalaLibrary layer for all of the jar dependencies.
    */
-  object AllLibraryJars extends AllLibraryJars
+  case object AllLibraryJars extends AllLibraryJars
 }