diff --git a/Network/Wreq/Lens/Machinery.hs b/Network/Wreq/Lens/Machinery.hs
index 782d965..0c97d27 100644
--- a/Network/Wreq/Lens/Machinery.hs
+++ b/Network/Wreq/Lens/Machinery.hs
@@ -13,8 +13,8 @@ import Language.Haskell.TH.Syntax (Dec, Name, Q, mkName, nameBase)
 defaultRules :: LensRules
 defaultRules = lensRules

-fieldName :: (String -> String) -> [Name] -> Name -> [DefName]
-fieldName f _ name = [TopName . mkName . f . nameBase $ name]
+fieldName :: (String -> String) -> Name -> [Name] -> Name -> [DefName]
+fieldName f _ _ name = [TopName . mkName . f . nameBase $ name]

 makeLenses :: Name -> Q [Dec]
 makeLenses = makeLensesWith (defaultRules & lensField .~ fieldName id)