diff --git a/test/serialization_test.rb b/test/serialization_test.rb
index 2bcc1c9a..f2c1faea 100644
--- a/test/serialization_test.rb
+++ b/test/serialization_test.rb
@@ -214,7 +214,7 @@ class RenderJsonTest < ActionController::TestCase
   def test_render_json_with_callback
     get :render_json_hello_world_with_callback
     assert_equal 'alert({"hello":"world"})', @response.body
-    assert_equal 'application/json', @response.content_type
+    assert_match %r(application/json|text/javascript), @response.content_type
   end
 
   def test_render_json_with_custom_content_type