diff --git a/Web/Cookie.hs b/Web/Cookie.hs
--- a/Web/Cookie.hs
+++ b/Web/Cookie.hs
@@ -108,14 +108,18 @@
 
 instance NFData SetCookie where
     rnf (SetCookie a b c d e f g h) =
-        rnf a `seq`
-        rnf b `seq`
-        rnf c `seq`
+        a `seq`
+        b `seq`
+        rnfMBS c `seq`
         rnf d `seq`
         rnf e `seq`
-        rnf f `seq`
+        rnfMBS f `seq`
         rnf g `seq`
         rnf h
+      where
+        -- For backwards compatibility
+        rnfMBS Nothing = ()
+        rnfMBS (Just bs) = bs `seq` ()
 
 instance Default SetCookie where
     def = SetCookie
diff --git a/cookie.cabal b/cookie.cabal
--- a/cookie.cabal
+++ b/cookie.cabal
@@ -1,5 +1,5 @@
 name:            cookie
-version:         0.4.1
+version:         0.4.1.1
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>