diff --git a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
index 11739e08d9f4cf6a8be8c138b1e684a9278cb9b8..dbe3206808097c2260d928684959dbcc3f3e26f4 100644
--- a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
+++ b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
@@ -50,7 +50,7 @@ def call(env)
         # Only this middleware cares about RoutingError. So, let's just raise
         # it here.
         if headers['X-Cascade'] == 'pass'
-           exception = ActionController::RoutingError.new("No route matches #{env['PATH_INFO'].inspect}")
+           raise ActionController::RoutingError, "No route matches #{env['PATH_INFO'].inspect}"
         end
       rescue Exception => exception
         raise exception if env['action_dispatch.show_exceptions'] == false
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 03bfe178e5add83a0ec984f12c2cafd22e8cbaa2..683fa1938088210db742a2adf3f775a6bd39d1d7 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -450,7 +450,7 @@ def generate
         end
 
         def raise_routing_error
-          raise ActionController::RoutingError.new("No route matches #{options.inspect}")
+          raise ActionController::RoutingError, "No route matches #{options.inspect}"
         end
 
         def different_controller?