diff --git a/.travis.yml b/.travis.yml
index 534bb80ef..d917c6885 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -35,8 +35,9 @@ env:
     - SBT_CMD="scripted tests/*"
     - SBT_CMD="scripted project-load/*"
     - SBT_CMD="checkBuildScala211"
-    - SBT_CMD="mavenResolverPluginTest:scripted dependency-management/*1of2 project/transitive-plugins"
+    - SBT_CMD="repoOverrideTest:scripted dependency-management/*"
     - SBT_CMD="mavenResolverPluginTest:scripted dependency-management/*2of2"
+    - SBT_CMD="mavenResolverPluginTest:scripted dependency-management/*1of2 project/transitive-plugins"
 
 notifications:
   email:
diff --git a/build.sbt b/build.sbt
index 6320b7470..69a504aa1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -500,13 +500,15 @@ def scriptedTask: Def.Initialize[InputTask[Unit]] = Def.inputTask {
   (altLocalPublish in interfaceProj).value
   (altLocalPublish in compileInterfaceProj).value
   doScripted((sbtLaunchJar in bundledLauncherProj).value, (fullClasspath in scriptedSbtProj in Test).value,
-    (scalaInstance in scriptedSbtProj).value, scriptedSource.value, result, scriptedPrescripted.value)
+    (scalaInstance in scriptedSbtProj).value, scriptedSource.value, result, scriptedPrescripted.value,
+    scriptedLaunchOpts.value)
 }
 
 def scriptedUnpublishedTask: Def.Initialize[InputTask[Unit]] = Def.inputTask {
   val result = scriptedSource(dir => (s: State) => scriptedParser(dir)).parsed
   doScripted((sbtLaunchJar in bundledLauncherProj).value, (fullClasspath in scriptedSbtProj in Test).value,
-    (scalaInstance in scriptedSbtProj).value, scriptedSource.value, result, scriptedPrescripted.value)
+    (scalaInstance in scriptedSbtProj).value, scriptedSource.value, result, scriptedPrescripted.value,
+    scriptedLaunchOpts.value)
 }
 
 lazy val publishAll = TaskKey[Unit]("publish-all")
@@ -531,6 +533,7 @@ def rootSettings = fullDocSettings ++
   Transform.conscriptSettings(bundledLauncherProj)
 def otherRootSettings = Seq(
   Scripted.scriptedPrescripted := { addSbtAlternateResolver _ },
+  Scripted.scriptedLaunchOpts := List("-XX:MaxPermSize=256M", "-Xmx1G"),
   Scripted.scripted <<= scriptedTask,
   Scripted.scriptedUnpublished <<= scriptedUnpublishedTask,
   Scripted.scriptedSource := (sourceDirectory in sbtProj).value / "sbt-test",
@@ -539,6 +542,7 @@ def otherRootSettings = Seq(
   },
   aggregate in bintrayRelease := false
 ) ++ inConfig(Scripted.MavenResolverPluginTest)(Seq(
+  Scripted.scriptedLaunchOpts := List("-XX:MaxPermSize=256M", "-Xmx1G"),
   Scripted.scripted <<= scriptedTask,
   Scripted.scriptedUnpublished <<= scriptedUnpublishedTask,
   Scripted.scriptedPrescripted := { f =>
@@ -547,9 +551,17 @@ def otherRootSettings = Seq(
       IO.write(inj, "addMavenResolverPlugin")
       // sLog.value.info(s"""Injected project/maven.sbt to $f""")
     }
-
     addSbtAlternateResolver(f)
   }
+)) ++ inConfig(Scripted.RepoOverrideTest)(Seq(
+  Scripted.scriptedPrescripted := { _ => () },
+  Scripted.scriptedLaunchOpts := {
+    List("-XX:MaxPermSize=256M", "-Xmx1G", "-Dsbt.override.build.repos=true",
+      s"""-Dsbt.repository.config=${ Scripted.scriptedSource.value / "repo.config" }""")
+  },
+  Scripted.scripted <<= scriptedTask,
+  Scripted.scriptedUnpublished <<= scriptedUnpublishedTask,
+  Scripted.scriptedSource := (sourceDirectory in sbtProj).value / "repo-override-test"
 ))
 
 def addSbtAlternateResolver(scriptedRoot: File) = {
diff --git a/project/Scripted.scala b/project/Scripted.scala
index aa3e55db6..51295b1d4 100644
--- a/project/Scripted.scala
+++ b/project/Scripted.scala
@@ -10,8 +10,10 @@ object Scripted {
   lazy val scriptedUnpublished = InputKey[Unit]("scripted-unpublished", "Execute scripted without publishing SBT first. Saves you some time when only your test has changed.")
   lazy val scriptedSource = SettingKey[File]("scripted-source")
   lazy val scriptedPrescripted = TaskKey[File => Unit]("scripted-prescripted")
+  lazy val scriptedLaunchOpts = SettingKey[Seq[String]]("scripted-launch-opts", "options to pass to jvm launching scripted tasks")
 
   lazy val MavenResolverPluginTest = config("mavenResolverPluginTest") extend Compile
+  lazy val RepoOverrideTest = config("repoOverrideTest") extend Compile
 
   import sbt.complete._
   import DefaultParsers._
@@ -66,13 +68,14 @@ object Scripted {
       launchOpts: Array[String], prescripted: java.util.List[File]): Unit
   }
 
-  def doScripted(launcher: File, scriptedSbtClasspath: Seq[Attributed[File]], scriptedSbtInstance: ScalaInstance, sourcePath: File, args: Seq[String], prescripted: File => Unit): Unit = {
+  def doScripted(launcher: File, scriptedSbtClasspath: Seq[Attributed[File]],
+    scriptedSbtInstance: ScalaInstance, sourcePath: File, args: Seq[String],
+    prescripted: File => Unit, launchOpts: Seq[String]): Unit = {
     System.err.println(s"About to run tests: ${args.mkString("\n * ", "\n * ", "\n")}")
     val noJLine = new classpath.FilteredLoader(scriptedSbtInstance.loader, "jline." :: Nil)
     val loader = classpath.ClasspathUtilities.toLoader(scriptedSbtClasspath.files, noJLine)
     val bridgeClass = Class.forName("sbt.test.ScriptedRunner", true, loader)
     val bridge = bridgeClass.newInstance.asInstanceOf[SbtScriptedRunner]
-    val launcherVmOptions = Array("-XX:MaxPermSize=256M", "-Xmx1G") // increased after a failure in scripted source-dependencies/macro
     try {
       // Using java.util.List to encode File => Unit.
       val callback = new java.util.AbstractList[File] {
@@ -83,7 +86,7 @@ object Scripted {
         def get(x: Int): sbt.File = ???
         def size(): Int = 0
       }
-      bridge.run(sourcePath, true, args.toArray, launcher, launcherVmOptions, callback)
+      bridge.run(sourcePath, true, args.toArray, launcher, launchOpts.toArray, callback)
     } catch { case ite: java.lang.reflect.InvocationTargetException => throw ite.getCause }
   }
 }
diff --git a/sbt/src/repo-override-test/dependency-management/default-resolvers/build.sbt b/sbt/src/repo-override-test/dependency-management/default-resolvers/build.sbt
new file mode 100644
index 000000000..7984b34c7
--- /dev/null
+++ b/sbt/src/repo-override-test/dependency-management/default-resolvers/build.sbt
@@ -0,0 +1,11 @@
+lazy val check = taskKey[Unit]("")
+
+lazy val root = (project in file(".")).
+  settings(
+    autoScalaLibrary := false,
+    check := {
+      val ar = appResolvers.value.get
+      assert(!(ar exists { _.name == "jcenter" }))
+      assert(!(ar exists { _.name == "public" }))
+    }
+  )
diff --git a/sbt/src/repo-override-test/dependency-management/default-resolvers/test b/sbt/src/repo-override-test/dependency-management/default-resolvers/test
new file mode 100644
index 000000000..15675b169
--- /dev/null
+++ b/sbt/src/repo-override-test/dependency-management/default-resolvers/test
@@ -0,0 +1 @@
+> check
diff --git a/sbt/src/repo-override-test/repo.config b/sbt/src/repo-override-test/repo.config
new file mode 100644
index 000000000..f3301bb9f
--- /dev/null
+++ b/sbt/src/repo-override-test/repo.config
@@ -0,0 +1,3 @@
+[repositories]
+  local
+  typesafe-ivy-releases: https://repo.typesafe.com/typesafe/ivy-releases/, [organization]/[module]/[revision]/[type]s/[artifact](-[classifier]).[ext]