diff --git a/hindent.cabal b/hindent.cabal
--- a/hindent.cabal
+++ b/hindent.cabal
@@ -1,5 +1,5 @@
 name:                hindent
-version:             3.2
+version:             3.3
 synopsis:            Extensible Haskell pretty printer
 description:         Extensible Haskell pretty printer. Both a library and an executable.
                      .
diff --git a/src/HIndent/Pretty.hs b/src/HIndent/Pretty.hs
--- a/src/HIndent/Pretty.hs
+++ b/src/HIndent/Pretty.hs
@@ -74,7 +74,7 @@
 -- * Pretty printing class
 
 -- | Pretty printing class.
-class (Annotated ast,Typeable ast) => Pretty ast where
+class (Annotated ast,Typeable1 ast) => Pretty ast where
   prettyInternal :: ast NodeInfo -> Printer ()
 
 -- | Pretty print using extenders.