diff --git a/happstack-static-routing.cabal b/happstack-static-routing.cabal
--- a/happstack-static-routing.cabal
+++ b/happstack-static-routing.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-static-routing
-Version:             0.2
+Version:             0.3
 Synopsis: Support for static URL routing with overlap detection for Happstack.
 
 Description: If you have a large routing table in Happstack and want
diff --git a/src/Happstack/StaticRouting/Internal.hs b/src/Happstack/StaticRouting/Internal.hs
--- a/src/Happstack/StaticRouting/Internal.hs
+++ b/src/Happstack/StaticRouting/Internal.hs
@@ -35,15 +35,16 @@
 type EndSegment = (Maybe Int, H.Method)
 
 -- | Support for varying number of arguments to 'path' handlers.
-class Path m a b | a b -> m where
-  pathHandler :: (m b -> m c) -> a -> m c
+class Path m hm a b | a b -> m hm where
+  pathHandler :: (m b -> hm c) -> a -> hm c
   arity :: m b -> a -> Int
 
-instance (FromReqURI d, ServerMonad m, MonadPlus m, Path m a b) => Path m (d -> a) b where
+instance (FromReqURI d, ServerMonad hm, MonadPlus hm, Path m hm a b)
+         => Path m hm (d -> a) b where
   pathHandler w f = H.path (pathHandler w . f)
   arity m f = 1 + arity m (f undefined)
 
-instance Path m (m b) b where
+instance Path m hm (m b) b where
   pathHandler w m = w m
   arity _ _ = 0
 
@@ -56,7 +57,7 @@
 choice = Choice
 
 -- | Expect the given method, and exactly 'n' more segments, where 'n' is the arity of the handler.
-path :: forall m h a b. Path m h a => H.Method -> (m a -> m b) -> h -> Route (m b)
+path :: forall m hm h a b. Path m hm h a => H.Method -> (m a -> hm b) -> h -> Route (hm b)
 path m w h = Handler (Just (arity (undefined::m a) h),m) (pathHandler w h)
 
 -- | Expect zero or more segments.