diff --git a/lib/http/cookie_jar/cookiestxt_saver.rb b/lib/http/cookie_jar/cookiestxt_saver.rb
index 09df0bd..a19a841 100644
--- a/lib/http/cookie_jar/cookiestxt_saver.rb
+++ b/lib/http/cookie_jar/cookiestxt_saver.rb
@@ -32,7 +32,7 @@ class HTTP::CookieJar::CookiestxtSaver < HTTP::CookieJar::AbstractSaver
   def cookie_to_record(cookie)
     cookie.instance_eval {
       [
-        @domain,
+        dot_domain,
         @for_domain ? True : False,
         @path,
         @secure ? True : False,
diff --git a/test/test_http_cookie_jar.rb b/test/test_http_cookie_jar.rb
index 4330134..c104e41 100644
--- a/test/test_http_cookie_jar.rb
+++ b/test/test_http_cookie_jar.rb
@@ -368,10 +368,16 @@ class TestHTTPCookieJar < Test::Unit::TestCase
     assert_equal(3, @jar.cookies(url).length)
 
     Dir.mktmpdir do |dir|
-      @jar.save(File.join(dir, "cookies.txt"), :cookiestxt)
+      filename = File.join(dir, "cookies.txt")
+      @jar.save(filename, :cookiestxt)
+
+      content = File.read(filename)
+
+      assert_match(/^\.rubyforge\.org\t.*\tFoo\t/, content)
+      assert_match(/^rubyforge\.org\t.*\tBaz\t/, content)
 
       jar = HTTP::CookieJar.new
-      jar.load(File.join(dir, "cookies.txt"), :cookiestxt) # HACK test the format
+      jar.load(filename, :cookiestxt) # HACK test the format
       cookies = jar.cookies(url)
       assert_equal(2, cookies.length)
       cookies.each { |cookie|