diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/IvyScalaExtra.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/IvyScalaExtra.scala
index 13cd79154..4cfffd856 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/IvyScalaExtra.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/IvyScalaExtra.scala
@@ -62,13 +62,22 @@ private[sbt] abstract class IvyScalaFunctions {
       // Mediate only for the dependencies in scalaVersion configurations. https://github.com/sbt/sbt/issues/2786
       def configQualifies: Boolean =
         (dd.getModuleConfigurations exists { scalaVersionConfigs })
+      // Do not rewrite the dependencies of Scala dependencies themselves, this prevents bootstrapping
+      // a Scala compiler using another Scala compiler.
+      def dependeeQualifies: Boolean =
+        dd.getParentRevisionId.getName match {
+          case name @ (CompilerID | LibraryID | ReflectID | ActorsID | ScalapID) =>
+            false
+          case _ =>
+            true
+        }
       val transformer =
         new NamespaceTransformer {
           def transform(mrid: ModuleRevisionId): ModuleRevisionId = {
             if (mrid == null) mrid
             else
               mrid.getName match {
-                case name @ (CompilerID | LibraryID | ReflectID | ActorsID | ScalapID) if configQualifies =>
+                case name @ (CompilerID | LibraryID | ReflectID | ActorsID | ScalapID) if configQualifies && dependeeQualifies =>
                   ModuleRevisionId.newInstance(scalaOrganization, name, mrid.getBranch, scalaVersion, mrid.getQualifiedExtraAttributes)
                 case _ => mrid
               }