diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+* 0.2.2.1: 11 December 2012
+
+  - Small fix to allow building under older GHCs
+
 * 0.2.2.0: 10 December 2012
 
   - Add new module Data.Monoid.Recommend
diff --git a/monoid-extras.cabal b/monoid-extras.cabal
--- a/monoid-extras.cabal
+++ b/monoid-extras.cabal
@@ -1,5 +1,5 @@
 name:                monoid-extras
-version:             0.2.2.0
+version:             0.2.2.1
 synopsis:            Various extra monoid-related definitions and utilities
 description:         Various extra monoid-related definitions and utilities,
                      such as monoid actions, monoid coproducts, \"deletable\"
diff --git a/src/Data/Monoid/MList.hs b/src/Data/Monoid/MList.hs
--- a/src/Data/Monoid/MList.hs
+++ b/src/Data/Monoid/MList.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE TypeOperators
            , MultiParamTypeClasses
+           , TypeSynonymInstances
            , FlexibleInstances
            , OverlappingInstances
            , UndecidableInstances