diff --git a/Web/Routes/PathInfo.hs b/Web/Routes/PathInfo.hs
--- a/Web/Routes/PathInfo.hs
+++ b/Web/Routes/PathInfo.hs
@@ -32,6 +32,7 @@
 import Control.Monad (msum)
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Int (Int64)
 import Data.List as List (stripPrefix, tails)
 import Data.Text as Text (Text, pack, unpack, null, tails, stripPrefix)
 import Data.Text.Encoding (decodeUtf8)
@@ -337,21 +338,20 @@
 
 instance PathInfo Int where
   toPathSegments i = [pack $ show i]
-  fromPathSegments = pToken (const "Int") checkInt
-   where checkInt txt =
-           case signed decimal txt of
-             (Left e) -> Nothing
-             (Right (n, r))
-                 | Text.null r -> Just n
-                 | otherwise -> Nothing
+  fromPathSegments = pToken (const "Int") checkIntegral
 
 instance PathInfo Integer where
   toPathSegments i = [pack $ show i]
-  fromPathSegments = pToken (const "Integer") checkInt
-   where checkInt txt =
-           case signed decimal txt of
-             (Left e) -> Nothing
-             (Right (n, r))
-                 | Text.null r -> Just n
-                 | otherwise -> Nothing
+  fromPathSegments = pToken (const "Integer") checkIntegral
 
+instance PathInfo Int64 where
+  toPathSegments i = [pack $ show i]
+  fromPathSegments = pToken (const "Int64") checkIntegral
+
+checkIntegral :: Integral a => Text -> Maybe a
+checkIntegral txt =
+  case signed decimal txt of
+    (Left e) -> Nothing
+    (Right (n, r))
+       | Text.null r -> Just n
+       | otherwise -> Nothing
diff --git a/web-routes.cabal b/web-routes.cabal
--- a/web-routes.cabal
+++ b/web-routes.cabal
@@ -1,5 +1,5 @@
 Name:             web-routes
-Version:          0.27.11
+Version:          0.27.12
 License:          BSD3
 License-File:     LICENSE
 Author:           jeremy@seereason.com
@@ -10,7 +10,7 @@
 Homepage:         http://www.happstack.com/docs/crashcourse/index.html#web-routes
 Cabal-Version:    >= 1.8
 Build-type:       Simple
-tested-with:      GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.3
+tested-with:      GHC == 7.8.4, GHC == 7.10.3, GHC == 8.0.1
 
 test-suite Test
   type             : exitcode-stdio-1.0