diff --git a/happstack-server.cabal b/happstack-server.cabal
--- a/happstack-server.cabal
+++ b/happstack-server.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-server
-Version:             6.4.3
+Version:             6.4.4
 Synopsis:            Web related tools and services.
 Description:         Happstack Server provides an HTTP server and a rich set of functions for routing requests, handling query parameters, generating responses, working with cookies, serving files, and more. For in-depth documentation see the Happstack Crash Course <http://happstack.com/docs/crashcourse/index.html>
 License:             BSD3
diff --git a/src/Happstack/Server/Internal/Types.hs b/src/Happstack/Server/Internal/Types.hs
--- a/src/Happstack/Server/Internal/Types.hs
+++ b/src/Happstack/Server/Internal/Types.hs
@@ -40,7 +40,7 @@
 import Happstack.Server.Internal.RFC822Headers ( ContentType(..) )
 import Happstack.Server.Internal.Cookie
 import Happstack.Server.Internal.LogFormat (formatRequestCombined)
-import Numeric (readDec)
+import Numeric (readDec, readSigned)
 import System.Log.Logger (Priority(..), logM)
 import Text.Show.Functions ()
 
@@ -435,17 +435,17 @@
 
 instance FromReqURI String  where fromReqURI = Just
 instance FromReqURI Char    where fromReqURI s = case s of [c] -> Just c ; _ -> Nothing
-instance FromReqURI Int     where fromReqURI = fromReadS . readDec
-instance FromReqURI Int8    where fromReqURI = fromReadS . readDec
-instance FromReqURI Int16   where fromReqURI = fromReadS . readDec                                  
-instance FromReqURI Int32   where fromReqURI = fromReadS . readDec                                  
-instance FromReqURI Int64   where fromReqURI = fromReadS . readDec                                  
-instance FromReqURI Integer where fromReqURI = fromReadS . readDec
+instance FromReqURI Int     where fromReqURI = fromReadS . readSigned readDec
+instance FromReqURI Int8    where fromReqURI = fromReadS . readSigned readDec
+instance FromReqURI Int16   where fromReqURI = fromReadS . readSigned readDec
+instance FromReqURI Int32   where fromReqURI = fromReadS . readSigned readDec
+instance FromReqURI Int64   where fromReqURI = fromReadS . readSigned readDec
+instance FromReqURI Integer where fromReqURI = fromReadS . readSigned readDec
 instance FromReqURI Word    where fromReqURI = fromReadS . readDec
-instance FromReqURI Word8   where fromReqURI = fromReadS . readDec                                  
-instance FromReqURI Word16  where fromReqURI = fromReadS . readDec                                  
-instance FromReqURI Word32  where fromReqURI = fromReadS . readDec                                  
-instance FromReqURI Word64  where fromReqURI = fromReadS . readDec                                  
+instance FromReqURI Word8   where fromReqURI = fromReadS . readDec
+instance FromReqURI Word16  where fromReqURI = fromReadS . readDec
+instance FromReqURI Word32  where fromReqURI = fromReadS . readDec
+instance FromReqURI Word64  where fromReqURI = fromReadS . readDec
 instance FromReqURI Float   where fromReqURI = readM
 instance FromReqURI Double  where fromReqURI = readM
 instance FromReqURI Bool    where