diff --git a/Yesod/Internal/Core.hs b/Yesod/Internal/Core.hs
--- a/Yesod/Internal/Core.hs
+++ b/Yesod/Internal/Core.hs
@@ -244,8 +244,8 @@
       where
         corrected = filter (not . T.null) s
 
-    -- | Builds an absolute URL by concatenating the application root with the  
-    -- pieces of a path and a query string, if any. 
+    -- | Builds an absolute URL by concatenating the application root with the
+    -- pieces of a path and a query string, if any.
     -- Note that the pieces of the path have been previously cleaned up by 'cleanPath'.
     joinPath :: a
              -> T.Text -- ^ application root
@@ -291,6 +291,12 @@
     cookiePath :: a -> S8.ByteString
     cookiePath _ = "/"
 
+    -- | The domain value to set for cookies. By default, the
+    -- domain is not set, meaning cookies will be sent only to
+    -- the current domain.
+    cookieDomain :: a -> Maybe S8.ByteString
+    cookieDomain _ = Nothing
+
     -- | Maximum allowed length of the request body, in bytes.
     maximumContentLength :: a -> Maybe (Route a) -> Int
     maximumContentLength _ _ = 2 * 1024 * 1024 -- 2 megabytes
@@ -370,7 +376,7 @@
 -- turn the TH Loc loaction information into a human readable string
 -- leaving out the loc_end parameter
 fileLocationToString :: Loc -> String
-fileLocationToString loc = (loc_package loc) ++ ':' : (loc_module loc) ++  
+fileLocationToString loc = (loc_package loc) ++ ':' : (loc_module loc) ++
   ' ' : (loc_filename loc) ++ ':' : (line loc) ++ ':' : (char loc)
   where
     line = show . fst . loc_start
@@ -454,7 +460,7 @@
                             , setCookieValue = sessionVal
                             , setCookiePath = Just (cookiePath master)
                             , setCookieExpires = Just $ getExpires (clientSessionDuration master)
-                            , setCookieDomain = Nothing
+                            , setCookieDomain = cookieDomain master
                             , setCookieHttpOnly = True
                             }
                           : hs
diff --git a/test/test.hs b/test/test.hs
deleted file mode 100644
--- a/test/test.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-import Test.Hspec
-import qualified YesodCoreTest
-
-main :: IO ()
-main = hspecX $ descriptions $ YesodCoreTest.specs
diff --git a/yesod-core.cabal b/yesod-core.cabal
--- a/yesod-core.cabal
+++ b/yesod-core.cabal
@@ -1,5 +1,5 @@
 name:            yesod-core
-version:         0.10.2.2
+version:         0.10.3
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>