diff --git a/Spock.cabal b/Spock.cabal
--- a/Spock.cabal
+++ b/Spock.cabal
@@ -1,5 +1,5 @@
 name:                Spock
-version:             0.4.0.0
+version:             0.4.0.1
 synopsis:            Another Haskell web toolkit based on scotty
 description:         This toolbox provides everything you need to get a quick start into web hacking with haskell: sessions, database helper, authentication and the power of scotty
 Homepage:            https://github.com/agrafix/Spock
diff --git a/Web/Spock/Monad.hs b/Web/Spock/Monad.hs
--- a/Web/Spock/Monad.hs
+++ b/Web/Spock/Monad.hs
@@ -36,7 +36,8 @@
 getSessMgr = webM $ asks web_sessionMgr
 
 instance Parsable BSL.ByteString where
-    parseParam = Right . BSL.fromStrict . T.encodeUtf8 . TL.toStrict
+    parseParam =
+        Right . BSL.fromStrict . T.encodeUtf8 . TL.toStrict
 
 instance Parsable UTCTime where
     parseParam p =
@@ -45,9 +46,3 @@
               Left $ TL.pack $ "Can't parse param (`" ++ show p ++ "`) as UTCTime!"
           Just x ->
               Right x
-
-instance Integral a => Parsable a where
-    parseParam p =
-        let eInt :: Either TL.Text Integer
-            eInt = readEither p
-        in fmap fromInteger eInt