diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.8.1.0
+
+- Add `Old` type family mapping newtypes to their underlying type.
+
 # 0.8.0.0
 
 - Add `GenericProduct`, for deriving `via GenericProduct B` when `B` is not the
diff --git a/generic-data.cabal b/generic-data.cabal
--- a/generic-data.cabal
+++ b/generic-data.cabal
@@ -1,5 +1,5 @@
 name:                generic-data
-version:             0.8.0.0
+version:             0.8.1.0
 synopsis:            Deriving instances with GHC.Generics and related utilities
 description:
   Generic implementations of standard type classes.
diff --git a/src/Generic/Data.hs b/src/Generic/Data.hs
--- a/src/Generic/Data.hs
+++ b/src/Generic/Data.hs
@@ -119,6 +119,7 @@
     -- * Newtype
     -- | Generic pack/unpack.
   , Newtype
+  , Old
   , pack
   , unpack