diff --git a/Yesod/Fay.hs b/Yesod/Fay.hs
--- a/Yesod/Fay.hs
+++ b/Yesod/Fay.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE FlexibleContexts      #-}
 {-# LANGUAGE FlexibleInstances     #-}
@@ -272,7 +273,11 @@
         } fp
       case result of
         Left e -> return (Left e)
+#if MIN_VERSION_fay(0,19,0)
         Right (source',_,state) -> do
+#else
+        Right (source',state) -> do
+#endif
           let files = stateImported state
               source = "\n(function(){\n" ++ source' ++ "\n})();\n"
               (fp_hi,fp_o) = refreshTo
@@ -367,7 +372,9 @@
         liftIO (compileFayFile (mkfp name) config
                 { configTypecheck = False
                 , configExportRuntime = exportRuntime
+#if MIN_VERSION_fay(0, 19, 0)
                 , configSourceMap = True
+#endif
                 })
                 >>= \eres -> do
         (case eres of
diff --git a/yesod-fay.cabal b/yesod-fay.cabal
--- a/yesod-fay.cabal
+++ b/yesod-fay.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                yesod-fay
-version:             0.4.0.4
+version:             0.4.0.5
 synopsis:            Utilities for using the Fay Haskell-to-JS compiler with Yesod.
 description:         For initial discussion, see <http://www.yesodweb.com/blog/2012/10/yesod-fay-js>. This is a work-in-progress.
 homepage:            https://github.com/fpco/yesod-fay