diff --git a/yesod-auth/Yesod/Auth/GoogleEmail.hs b/yesod-auth/Yesod/Auth/GoogleEmail.hs
index 252ddc70..d9ce98fe 100644
--- a/yesod-auth/Yesod/Auth/GoogleEmail.hs
+++ b/yesod-auth/Yesod/Auth/GoogleEmail.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE RankNTypes #-}
 -- | Use an email address as an identifier via Google's OpenID login system.
 --
 -- This backend will not use the OpenID identifier at all. It only uses OpenID
diff --git a/yesod-auth/Yesod/Auth/OpenId.hs b/yesod-auth/Yesod/Auth/OpenId.hs
index beaaa7c5..d2e20c5b 100644
--- a/yesod-auth/Yesod/Auth/OpenId.hs
+++ b/yesod-auth/Yesod/Auth/OpenId.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE RankNTypes #-}
 module Yesod.Auth.OpenId
     ( authOpenId
     , forwardUrl
diff --git a/yesod-core/Yesod/Core/Handler.hs b/yesod-core/Yesod/Core/Handler.hs
index e53837ac..994f7b0d 100644
--- a/yesod-core/Yesod/Core/Handler.hs
+++ b/yesod-core/Yesod/Core/Handler.hs
@@ -7,6 +7,7 @@
 {-# LANGUAGE RecordWildCards            #-}
 {-# LANGUAGE TupleSections              #-}
 {-# LANGUAGE TypeFamilies               #-}
+{-# LANGUAGE RankNTypes                 #-}
 ---------------------------------------------------------
 --
 -- Module        : Yesod.Handler