diff --git a/Mighty.hs b/Mighty.hs
--- a/Mighty.hs
+++ b/Mighty.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE OverloadedStrings, DoAndIfThenElse #-}
+{-# LANGUAGE OverloadedStrings #-}
 
 module Main where
 
@@ -28,7 +28,7 @@
     route <- fileName 1 >>= parseRoute
     if opt_debug_mode opt then
         server opt route
-    else
+      else
         daemonize $ server opt route
   where
     fileName n = do
@@ -50,7 +50,7 @@
         forkIO $ single opt route s logtype
         myid <- getProcessID
         logController logtype [myid]
-    else do
+      else do
         cids <- multi opt route s logtype
         logController logtype cids
   where
@@ -65,7 +65,7 @@
         setFileMode pidfile 0o644
     handler :: SomeException -> IO ()
     handler e
-      | debug = hPutStrLn stderr $ show e
+      | debug = hPrint stderr e
       | otherwise = writeFile "/tmp/mighty_error" (show e)
     logspec = FileLogSpec {
         log_file          = opt_log_file opt
@@ -95,6 +95,7 @@
         settingsPort        = opt_port opt
       , settingsOnException = printStdout
       , settingsTimeout     = opt_connection_timeout opt
+      , settingsHost        = HostAny
       }
     serverName = BS.pack $ opt_server_name opt
     cspec lgr = ClassicAppSpec {
@@ -166,4 +167,4 @@
 ignore _ = return ()
 
 printStdout :: SomeException -> IO ()
-printStdout e = print e
+printStdout = print
diff --git a/Route.hs b/Route.hs
--- a/Route.hs
+++ b/Route.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE OverloadedStrings, DoAndIfThenElse, TupleSections #-}
+{-# LANGUAGE OverloadedStrings, TupleSections #-}
 
 module Route (parseRoute) where
 
diff --git a/mighttpd2.cabal b/mighttpd2.cabal
--- a/mighttpd2.cabal
+++ b/mighttpd2.cabal
@@ -1,5 +1,5 @@
 Name:                   mighttpd2
-Version:                2.5.0
+Version:                2.5.1
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -19,7 +19,7 @@
                         network,
                         unix, bytestring, unix-bytestring,
                         warp, old-locale, time,
-                        wai-app-file-cgi, wai, transformers, http-types,
+                        wai-app-file-cgi, wai >= 1.1, transformers, http-types,
                         directory, filepath,
                         http-date, hashmap, deepseq, wai-logger-prefork,
                         http-conduit