diff --git a/cache/Cache.scala b/cache/Cache.scala
index 0cf5ccd12..238773b18 100644
--- a/cache/Cache.scala
+++ b/cache/Cache.scala
@@ -188,6 +188,22 @@ trait HListCacheImplicits
 		}
 		
 	implicit def hNilCache: InputCache[HNil] = Cache.singleton(HNil : HNil)
+
+	implicit def hConsFormat[H, T <: HList](implicit head: Format[H], tail: Format[T]): Format[H :+: T] = new Format[H :+: T] {
+		def reads(from: Input) =
+		{
+			val h = head.reads(from)
+			val t = tail.reads(from)
+			HCons(h, t)
+		}
+		def writes(to: Output, hc: H :+: T)
+		{
+			head.writes(to, hc.head)
+			tail.writes(to, hc.tail)
+		}
+	}
+
+	implicit def hNilFormat: Format[HNil] = asSingleton(HNil)
 }
 trait UnionImplicits
 {
diff --git a/cache/src/test/scala/CacheTest.scala b/cache/src/test/scala/CacheTest.scala
index ad6085fc1..481bfb9b6 100644
--- a/cache/src/test/scala/CacheTest.scala
+++ b/cache/src/test/scala/CacheTest.scala
@@ -10,6 +10,8 @@ object CacheTest// extends Properties("Cache test")
 
 	import Cache._
 	import FileInfo.hash._
+	import Ordering._
+	import sbinary.DefaultProtocol.FileFormat
 	def test
 	{
 		lazy val create = new File("test")