diff --git a/test/rails_test.rb b/test/rails_test.rb
index 822fc278..eb9616f2 100644
--- a/test/rails_test.rb
+++ b/test/rails_test.rb
@@ -40,8 +40,10 @@ def test_chooses_sets_alternatives_for_rails_tests
   def test_vanity_cookie_is_persistent
     get :index
     cookie = @response["Set-Cookie"].to_s
-    assert expires = cookie[/vanity_id=[a-f0-9]{32}; path=\/; expires=(.*)(;|$)/, 1]
-    assert_in_delta Time.parse(expires), Time.now + 1.month, 1.minute
+    assert_match cookie, /vanity_id=[a-f0-9]{32};/
+    expires = cookie[/expires=(.*)(;|$)/, 1]
+    assert expires
+    assert_in_delta Time.parse(expires), Time.now + 1.month, 1.day
   end
 
   def test_vanity_cookie_default_id