diff --git a/compdata.cabal b/compdata.cabal
--- a/compdata.cabal
+++ b/compdata.cabal
@@ -1,5 +1,5 @@
 Name:			compdata
-Version:		0.7.0.1
+Version:		0.7.0.2
 Synopsis:            	Compositional Data Types
 Description:
 
diff --git a/src/Data/Comp/Generic.hs b/src/Data/Comp/Generic.hs
--- a/src/Data/Comp/Generic.hs
+++ b/src/Data/Comp/Generic.hs
@@ -23,7 +23,7 @@
 import Data.Foldable
 import Data.Maybe
 import Data.Traversable
-import GHC.Exts
+import GHC.Exts (build)
 import Control.Monad hiding (mapM)
 import Prelude hiding (foldl,mapM)