diff --git a/internal/util-cache/src/main/scala/sbt/internal/util/AdditionalFormats.scala b/internal/util-cache/src/main/scala/sbt/internal/util/AdditionalFormats.scala
index 8008cf90a..7ec9ecf17 100644
--- a/internal/util-cache/src/main/scala/sbt/internal/util/AdditionalFormats.scala
+++ b/internal/util-cache/src/main/scala/sbt/internal/util/AdditionalFormats.scala
@@ -5,25 +5,7 @@ import sbt.internal.util.Types.:+:
 import sjsonnew.{ Builder, deserializationError, JsonFormat, Unbuilder }
 import sjsonnew.BasicJsonProtocol, BasicJsonProtocol.asSingleton
 
-import java.io.{ ByteArrayInputStream, ByteArrayOutputStream, File, InputStream, OutputStream }
-
-import java.net.{ URI, URL }
-
-trait URIFormat { self: BasicJsonProtocol =>
-  implicit def URIFormat: JsonFormat[URI] = project(_.toString, new URI(_: String))
-}
-
-trait URLFormat { self: BasicJsonProtocol =>
-  implicit def URLFormat: JsonFormat[URL] = project(_.toString, new URL(_: String))
-}
-
-trait FileFormat { self: BasicJsonProtocol =>
-  implicit def FileFormat: JsonFormat[File] = project(_.toString, new File(_: String))
-}
-
-trait SetFormat { self: BasicJsonProtocol =>
-  implicit def SetFormat[T: JsonFormat]: JsonFormat[Set[T]] = project(_.toSeq, (_: Seq[T]).toSet)
-}
+import java.io.{ ByteArrayInputStream, ByteArrayOutputStream, InputStream, OutputStream }
 
 trait HListFormat {
   implicit def HConsFormat[H: JsonFormat, T <: HList: JsonFormat]: JsonFormat[H :+: T] =
diff --git a/internal/util-cache/src/main/scala/sbt/internal/util/CacheImplicits.scala b/internal/util-cache/src/main/scala/sbt/internal/util/CacheImplicits.scala
index 0ebdf134b..b3d660074 100644
--- a/internal/util-cache/src/main/scala/sbt/internal/util/CacheImplicits.scala
+++ b/internal/util-cache/src/main/scala/sbt/internal/util/CacheImplicits.scala
@@ -4,8 +4,5 @@ import sjsonnew.BasicJsonProtocol
 
 object CacheImplicits extends BasicCacheImplicits
   with BasicJsonProtocol
-  with FileFormat
   with HListFormat
-  with URIFormat
-  with URLFormat
   with StreamFormat