1 files changed, 2 insertions, 2 deletions
diff --git a/actionpack/test/dispatch/mapper_test.rb b/actionpack/test/dispatch/mapper_test.rb
index d8d3209dac..3e554a9cf6 100644
--- a/actionpack/test/dispatch/mapper_test.rb
+++ b/actionpack/test/dispatch/mapper_test.rb
@@ -3,7 +3,7 @@ require 'abstract_unit'
 module ActionDispatch
   module Routing
     class MapperTest < ActiveSupport::TestCase
-      class FakeSet
+      class FakeSet < ActionDispatch::Routing::RouteSet
         attr_reader :routes
         alias :set :routes
 
@@ -38,7 +38,7 @@ module ActionDispatch
 
       def test_mapping_requirements
         options = { :controller => 'foo', :action => 'bar', :via => :get }
-        m = Mapper::Mapping.build({}, '/store/:name(*rest)', options)
+        m = Mapper::Mapping.build({}, FakeSet.new, '/store/:name(*rest)', options)
         _, _, requirements, _ = m.to_route
         assert_equal(/.+?/, requirements[:rest])
       end