diff --git a/main/src/main/scala/sbt/Keys.scala b/main/src/main/scala/sbt/Keys.scala
index 76df1e995..ca5bc5257 100644
--- a/main/src/main/scala/sbt/Keys.scala
+++ b/main/src/main/scala/sbt/Keys.scala
@@ -325,7 +325,7 @@ object Keys {
   val dependencyClasspathAsJars = taskKey[Classpath]("The classpath consisting of internal and external, managed and unmanaged dependencies, all as JARs.")
   val fullClasspathAsJars = taskKey[Classpath]("The exported classpath, consisting of build products and unmanaged and managed, internal and external dependencies, all as JARs.")
   val internalDependencyConfigurations = settingKey[Seq[(ProjectRef, Set[String])]]("The project configurations that this configuration depends on")
-  private[sbt] val allowZombieClassLoaders = settingKey[Boolean]("Allow a classloader that has previously been closed by `run` or `test` to continue loading classes.")
+  val allowZombieClassLoaders = settingKey[Boolean]("Allow a classloader that has previously been closed by `run` or `test` to continue loading classes.")
 
   val useCoursier = settingKey[Boolean]("Use Coursier for dependency resolution.").withRank(BSetting)
   val csrCacheDirectory = settingKey[File]("Coursier cache directory. Uses -Dsbt.coursier.home or Coursier's default.").withRank(CSetting)