diff --git a/cef.cabal b/cef.cabal
--- a/cef.cabal
+++ b/cef.cabal
@@ -1,5 +1,5 @@
 name:                cef
-version:             0.1.0.0
+version:             0.1.1
 synopsis:            CEF log format
 description:         This library is used to produce CEF log lines
 homepage:            http://github.com/picussecurity/haskell-cef.git
diff --git a/src/System/Log/CEF/Extensions.hs b/src/System/Log/CEF/Extensions.hs
--- a/src/System/Log/CEF/Extensions.hs
+++ b/src/System/Log/CEF/Extensions.hs
@@ -113,8 +113,6 @@
 
 --------------------------------------------------------------------------------
 import           Data.ByteString.Builder
-import           Data.Function
-import           Data.List               (intersperse)
 import           Data.Monoid
 import qualified Data.Text               as T
 import qualified Data.Text.Encoding      as T
@@ -130,7 +128,7 @@
   Extensions e1 `mappend` Extensions e2 = Extensions (e1 <> " " <> e2)
 
 emptyExtensions :: Extensions
-emptyExtensions = mempty
+emptyExtensions = Extensions mempty
 
 -- |
 -- >>> :set -XOverloadedStrings