2 files changed, 9 insertions, 3 deletions
diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index fee99faf43..4ea828c549 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -125,10 +125,10 @@ module Rails
     end
 
     def env_defaults
-      @env_defaults ||= {
+      @env_defaults ||= super.merge({
         "action_dispatch.parameter_filter" => config.filter_parameters,
         "action_dispatch.secret_token" => config.secret_token
-      }
+      })
     end
 
     def initializers
diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index 41b0a764e2..22a1a15bf5 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -159,7 +159,13 @@ module Rails
     end
 
     def call(env)
-      app.call(env)
+      app.call(env.reverse_merge!(env_defaults))
+    end
+
+    def env_defaults
+      @env_defaults ||= {
+        "action_dispatch.routes" => routes
+      }
     end
 
     def routes