diff --git a/lib/rack/session/dalli.rb b/lib/rack/session/dalli.rb
index ddab1fd6..47ab6c1b 100644
--- a/lib/rack/session/dalli.rb
+++ b/lib/rack/session/dalli.rb
@@ -13,7 +13,7 @@ class Dalli < Abstract::ID
       def initialize(app, options={})
         super
         mserv = @default_options[:memcache_server]
-        mopts = @default_options.reject{|k,v| !MemCache::DEFAULT_OPTIONS.include? k }
+        mopts = @default_options.reject{|k,v| !DEFAULT_OPTIONS.include? k }
         @pool = options[:cache] || Dalli::Client.new(mserv, mopts)
       end