--- a/Data/CSS/Build.hs
+++ b/Data/CSS/Build.hs
@@ -33,6 +33,7 @@
 import qualified Data.Set as S
 import Control.Applicative
 import Control.Lens hiding (below)
+import Control.Monad ((>=>))
 import Control.Monad.Reader
 import Control.Monad.Writer.Class
 import Data.CSS.Types
--- a/Data/CSS/Render.hs
+++ b/Data/CSS/Render.hs
@@ -17,6 +17,7 @@
 import qualified Data.Set as S
 import Blaze.ByteString.Builder
 import Blaze.ByteString.Builder.Char.Utf8
+import Control.Monad (liftM)
 import Control.Monad.Writer
 import Data.CSS.Types
 import Data.CSS.Utils