diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,11 @@
+2.11.1 (Changes from 2.11.0.1)
+=========================
+* Missing imports prevened data-lens from working on base earlier than 4.8.  This is now fixed.
+
+2.11.0.1 (Changes from 2.11)
+=========================
+* Bump lower bound on transformers
+
 2.11 (Changes from 2.10.7)
 =========================
 * Bump dependency on semigroupoids
diff --git a/data-lens.cabal b/data-lens.cabal
--- a/data-lens.cabal
+++ b/data-lens.cabal
@@ -1,6 +1,6 @@
 name:               data-lens
 category:           Control, Comonads
-version:            2.11.0.1
+version:            2.11.1
 license:            BSD3
 cabal-version:      >= 1.6
 license-file:       LICENSE
diff --git a/src/Data/Lens/Partial/Common.hs b/src/Data/Lens/Partial/Common.hs
--- a/src/Data/Lens/Partial/Common.hs
+++ b/src/Data/Lens/Partial/Common.hs
@@ -10,6 +10,7 @@
 import Data.Functor.Identity
 import Data.Functor.Sum
 import Data.Maybe
+import Data.Monoid (Monoid, mempty)
 import qualified Data.Monoid (Sum(..), Product(..))
 
 newtype PartialLens a b = PLens (a -> Maybe (Store b a))