diff --git a/actionpack/test/controller/caching_test.rb b/actionpack/test/controller/caching_test.rb
index 82c790bc199728980690027fa5201cafa6a2f540..25e035cb49ed319ed3f835d5a7cdd0bc1d48d18c 100644
--- a/actionpack/test/controller/caching_test.rb
+++ b/actionpack/test/controller/caching_test.rb
@@ -441,8 +441,8 @@ def test_xml_version_of_resource_is_treated_as_different_cache
 
   def test_correct_content_type_is_returned_for_cache_hit
     # run it twice to cache it the first time
-    get :index, :id => 'content-type.xml'
-    get :index, :id => 'content-type.xml'
+    get :index, :id => 'content-type', :format => 'xml'
+    get :index, :id => 'content-type', :format => 'xml'
     assert_equal 'application/xml', @response.content_type
   end