diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 3.1.6.1
+
+* Add `<>` import
+
 ## 3.1.6
 
 * Make ssAddTrailingSlash work in combination with ssIndices [#569](https://github.com/yesodweb/wai/pull/569)
diff --git a/WaiAppStatic/CmdLine.hs b/WaiAppStatic/CmdLine.hs
--- a/WaiAppStatic/CmdLine.hs
+++ b/WaiAppStatic/CmdLine.hs
@@ -25,6 +25,7 @@
 import WaiAppStatic.Types (ssIndices, toPiece, ssGetMimeType, fileName, fromPiece)
 import Data.Maybe (mapMaybe)
 import Control.Arrow (second)
+import Data.Monoid ((<>))
 
 data Args = Args
     { docroot :: FilePath
diff --git a/wai-app-static.cabal b/wai-app-static.cabal
--- a/wai-app-static.cabal
+++ b/wai-app-static.cabal
@@ -1,5 +1,5 @@
 name:            wai-app-static
-version:         3.1.6
+version:         3.1.6.1
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>