diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index e0deb84b0..cf7620bd8 100755
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -1182,12 +1182,15 @@ object Classpaths {
     externalResolvers <<= (externalResolvers.task.?, resolvers, appResolvers, useJCenter) {
       case (Some(delegated), Seq(), _, _) => delegated
       case (_, rs, Some(ars), uj)         => task { ars ++ rs }
-      case (_, rs, _, uj)                 => task { Resolver.withDefaultResolvers(rs, uj, true) }
+      case (_, rs, _, uj)                 => task { Resolver.withDefaultResolvers(rs, uj, mavenCentral = true) }
     },
     appResolvers := {
       val ac = appConfiguration.value
       val uj = useJCenter.value
-      appRepositories(ac) map { ars => Resolver.reorganizeAppResolvers(ars, uj, true) }
+      appRepositories(ac) map { ars =>
+        val useMavenCentral = ars contains DefaultMavenRepository
+        Resolver.reorganizeAppResolvers(ars, uj, useMavenCentral)
+      }
     },
     bootResolvers <<= appConfiguration map bootRepositories,
     fullResolvers <<= (projectResolver, externalResolvers, sbtPlugin, sbtResolver, bootResolvers, overrideBuildResolvers) map { (proj, rs, isPlugin, sbtr, boot, overrideFlag) =>