diff --git a/spec/system/support/cuprite_setup.rb b/spec/system/support/cuprite_setup.rb
index f75d42b7b0..07a42e7039 100644
--- a/spec/system/support/cuprite_setup.rb
+++ b/spec/system/support/cuprite_setup.rb
@@ -34,7 +34,8 @@ RSpec.configure do |config|
   # Make sure url helpers in mailers use the Capybara server host.
   config.around(:each, type: :system) do |example|
     original_host = Rails.application.default_url_options[:host]
-    Rails.application.default_url_options[:host] = Capybara.server_host
+    Rails.application.default_url_options[:host] =
+      "#{Capybara.current_session.server.host}:#{Capybara.current_session.server.port}"
     example.run
     Rails.application.default_url_options[:host] = original_host
   end