diff --git a/guides/source/rails_on_rack.md b/guides/source/rails_on_rack.md
index 00020a0ea5..aa1476ecc0 100644
--- a/guides/source/rails_on_rack.md
+++ b/guides/source/rails_on_rack.md
@@ -125,7 +125,7 @@ use ActionDispatch::Flash
 use Rack::Head
 use Rack::ConditionalGet
 use Rack::ETag
-run MyApp.application.routes
+run MyApp::Application.routes
 ```
 
 The default middlewares shown here (and some others) are each summarized in the [Internal Middlewares](#internal-middleware-stack) section, below.