diff --git a/project/Scripted.scala b/project/Scripted.scala
index d4119e2be..7bc7ccb06 100644
--- a/project/Scripted.scala
+++ b/project/Scripted.scala
@@ -121,7 +121,7 @@ object Scripted {
           prescripted: java.util.List[File],
           scalaVersion: String,
           sbtVersion: String,
-          classpath: Seq[File],
+          classpath: Array[File],
           instances: Int
       ): Unit
     }
@@ -154,7 +154,7 @@ object Scripted {
           callback,
           scalaVersion,
           sbtVersion,
-          classpath,
+          classpath.toArray,
           instances
         )
       } catch { case ite: InvocationTargetException => throw ite.getCause }
diff --git a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala
index 666d99a84..5919f6a45 100644
--- a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala
+++ b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala
@@ -392,7 +392,7 @@ object ScriptedTests extends ScriptedRunner {
       new java.util.ArrayList[File],
       defScalaVersion,
       sbtVersion,
-      cp.toSeq,
+      cp,
       1
     )
   }
@@ -413,7 +413,7 @@ class ScriptedRunner {
       prescripted: java.util.List[File],
       scalaVersion: String,
       sbtVersion: String,
-      classpath: Seq[File],
+      classpath: Array[File],
       instances: Int
   ): Unit = {
     val addTestFile = (f: File) => { prescripted.add(f); () }
@@ -444,7 +444,7 @@ class ScriptedRunner {
       prescripted: java.util.List[File],
       sbtVersion: String,
       scalaVersion: String,
-      classpath: Seq[File],
+      classpath: Array[File],
       instances: Int
   ): Unit =
     runInParallel(