diff --git a/servant/src/Servant/API/Auth.hs b/servant/src/Servant/API/Auth.hs
index e04c7cca..00a11adf 100644
--- a/servant/src/Servant/API/Auth.hs
+++ b/servant/src/Servant/API/Auth.hs
@@ -17,7 +17,7 @@ import           GHC.TypeLits  (Symbol)
 -- In Basic Auth, username and password are base64-encoded and transmitted via
 -- the @Authorization@ header. Handshakes are not required, making it
 -- relatively efficient.
-data BasicAuth (realm :: Symbol) (usr :: *)
+data BasicAuth (realm :: Symbol)
   deriving (Typeable)
 
 -- | A generalized Authentication combinator.