diff --git a/src/binary/Data/Binary/Builder.hs b/src/binary/Data/Binary/Builder.hs
index 66e2fa497..18b45763c 100644
--- a/src/binary/Data/Binary/Builder.hs
+++ b/src/binary/Data/Binary/Builder.hs
@@ -54,7 +54,7 @@ module Data.Binary.Builder (
 
   ) where
 
-import Foreign(Word8,Ptr,Storable,ForeignPtr,withForeignPtr,poke,plusPtr,sizeOf)
+import Foreign(Word,Word8,Ptr,Storable,ForeignPtr,withForeignPtr,poke,plusPtr,sizeOf)
 import System.IO.Unsafe(unsafePerformIO)
 import Data.Monoid
 --import Data.Word