diff --git a/log.cabal b/log.cabal
--- a/log.cabal
+++ b/log.cabal
@@ -1,5 +1,5 @@
 name:                log
-version:             0.1.0
+version:             0.1.1
 synopsis:            Structured logging solution with multiple backends
 
 description:         A library that provides a way to record structured log messages with multiple backends.
diff --git a/src/Log/Backend/StandardOutput.hs b/src/Log/Backend/StandardOutput.hs
--- a/src/Log/Backend/StandardOutput.hs
+++ b/src/Log/Backend/StandardOutput.hs
@@ -1,11 +1,13 @@
-{-# LANGUAGE OverloadedStrings, RecordWildCards #-}
+{-# LANGUAGE CPP, OverloadedStrings, RecordWildCards #-}
 module Log.Backend.StandardOutput (stdoutLogger) where
 
 import Data.Aeson.Encode.Pretty
 import Data.Aeson.Types
 import Data.ByteString.Lazy (toStrict)
 import Data.Time
+#if !MIN_VERSION_time(1,5,0)
 import System.Locale
+#endif
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as T
 import qualified Data.Text.IO as T
diff --git a/src/Log/Data.hs b/src/Log/Data.hs
--- a/src/Log/Data.hs
+++ b/src/Log/Data.hs
@@ -13,7 +13,8 @@
 data LogLevel = LogAttention | LogInfo | LogTrace
   deriving (Bounded, Eq, Ord, Show)
 
-instance NFData LogLevel
+instance NFData LogLevel where
+  rnf = (`seq` ())
 
 -- | Represents message to be logged.
 data LogMessage = LogMessage {