diff --git a/classyplate.cabal b/classyplate.cabal
--- a/classyplate.cabal
+++ b/classyplate.cabal
@@ -1,5 +1,5 @@
 name:                classyplate
-version:             0.2.1.0
+version:             0.2.2.0
 synopsis:            Fuseable type-class based generics
 -- description:         
 license:             BSD3
diff --git a/src/Data/Generics/ClassyPlate/TH.hs b/src/Data/Generics/ClassyPlate/TH.hs
--- a/src/Data/Generics/ClassyPlate/TH.hs
+++ b/src/Data/Generics/ClassyPlate/TH.hs
@@ -179,7 +179,7 @@
   where argNames = take (length args) $ map (mkName . ("a"++) . show) [0..]
         formalArgs = zip args argNames
         mapArgRep (Just t, n) = VarE 'topDownM_ `AppE` VarE tokenName `AppE` VarE funName `AppE` VarE n
-        mapArgRep (Nothing, n) = VarE n
+        mapArgRep (Nothing, n) = VarE 'return `AppE` VarE n
 
 
 -- * descend