diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [HEAD]
 
+## [0.5.0.1] - 2017-04-16
+### Changed
+- Fixed incompatibility with older versions of GHC.
+
 ## [0.5.0] - 2017-04-15
 ### Changed
 - Server keys management:
@@ -101,7 +105,8 @@
 - Initial version of the package.
 
 
-[HEAD]:    ../../compare/v0.5.0...HEAD
+[HEAD]:    ../../compare/v0.5.0.1...HEAD
+[0.5.0]:   ../../compare/v0.5.0...v0.5.0.1
 [0.5.0]:   ../../compare/v0.4.4...v0.5.0
 [0.4.4]:   ../../compare/v0.4.3.3...v0.4.4
 [0.4.3.3]: ../../compare/v0.4.3.2...v0.4.3.3
diff --git a/servant-auth-cookie.cabal b/servant-auth-cookie.cabal
--- a/servant-auth-cookie.cabal
+++ b/servant-auth-cookie.cabal
@@ -1,5 +1,5 @@
 name:                servant-auth-cookie
-version:             0.5.0
+version:             0.5.0.1
 synopsis:            Authentication via encrypted cookies
 description:         Authentication via encrypted client-side cookies,
                      inspired by client-session library by Michael Snoyman and based on
@@ -37,6 +37,7 @@
 
 flag build-examples
   description:        Build example executables.
+  manual:             True
   default:            False
 
 
diff --git a/src/Servant/Server/Experimental/Auth/Cookie.hs b/src/Servant/Server/Experimental/Auth/Cookie.hs
--- a/src/Servant/Server/Experimental/Auth/Cookie.hs
+++ b/src/Servant/Server/Experimental/Auth/Cookie.hs
@@ -466,7 +466,7 @@
   (currentKey, rotatedKeys) <- getKeys sks
   (serverKey, renew) <- if checkMac currentKey
     then return (currentKey, False)
-    else (,True) <$> maybe
+    else liftM (,True) $ maybe
       (throwM $ IncorrectMAC mac)
       (return)
       (listToMaybe . map fst . filter snd . map (id &&& checkMac) $ rotatedKeys)