diff --git a/http-date.cabal b/http-date.cabal
--- a/http-date.cabal
+++ b/http-date.cabal
@@ -1,5 +1,5 @@
 Name:                   http-date
-Version:                0.0.6
+Version:                0.0.6.1
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
diff --git a/test/Model.hs b/test/Model.hs
--- a/test/Model.hs
+++ b/test/Model.hs
@@ -1,11 +1,16 @@
+{-# LANGUAGE CPP #-}
+
 module Model where
 
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as BS8
 import Data.Time
 import Data.Time.Clock.POSIX
-import System.Locale
 import System.Posix.Types
+
+#if !MIN_VERSION_time(1,5,0)
+import System.Locale
+#endif
 
 epochTimeToUtcTime :: EpochTime -> UTCTime
 epochTimeToUtcTime = posixSecondsToUTCTime . realToFrac