diff --git a/simple-session.cabal b/simple-session.cabal
--- a/simple-session.cabal
+++ b/simple-session.cabal
@@ -1,5 +1,5 @@
 name:                simple-session
-version:             0.8.0
+version:             0.8.0.1
 synopsis:            Cookie-based session management for the Simple web framework
 description:
 
diff --git a/src/Web/Simple/Session.hs b/src/Web/Simple/Session.hs
--- a/src/Web/Simple/Session.hs
+++ b/src/Web/Simple/Session.hs
@@ -122,6 +122,7 @@
   ResponseFile stat (("Set-Cookie", cookie key value):hdrs) fl mfp
 addCookie (key, value) (ResponseBuilder stat hdrs bldr) =
   ResponseBuilder stat (("Set-Cookie", cookie key value):hdrs) bldr
+addCookie _ resp = resp -- Can't do anything for ResponseRaw
 
 cookie :: S.ByteString -> S.ByteString -> S.ByteString
 cookie key value = toByteString . renderSetCookie $