[Haskell-cafe] question concerning ANSI "void *"

Hello, Ok .. I am writing a Haskell function that will call down into the ANSI C library .. blah :: .... -> Ptr Word8 ....-> .... The underlying C function that "blah" is calling has a "void *" so I am using "Ptr Word 8" to model the "void *". I propose to have the callers of function "blah" to populate a data structure something like "Ptr Buz" where "data Buz = { ........} and then do a "recast :: Ptr Word 8 -> Ptr Buz" when invoking function "blah". Does this seem reasonable? Is there a better way? Thanks, Vasili