diff --git a/actionpack/test/dispatch/request/json_params_parsing_test.rb b/actionpack/test/dispatch/request/json_params_parsing_test.rb
index a07138b55e..6ab71ebc81 100644
--- a/actionpack/test/dispatch/request/json_params_parsing_test.rb
+++ b/actionpack/test/dispatch/request/json_params_parsing_test.rb
@@ -155,7 +155,7 @@ class RootLessJSONParamsParsingTest < ActionDispatch::IntegrationTest
   test "parses json params after custom json mime type registered" do
     begin
       Mime::Type.unregister :json
-      Mime::Type.register "application/json", :json, %w(application/vnd.api+json)
+      Mime::Type.register "application/json", :json, %w(application/vnd.rails+json)
       assert_parses(
         {"user" => {"username" => "meinac"}, "username" => "meinac"},
         "{\"username\": \"meinac\"}", { 'CONTENT_TYPE' => 'application/json' }
@@ -169,10 +169,10 @@ class RootLessJSONParamsParsingTest < ActionDispatch::IntegrationTest
   test "parses json params after custom json mime type registered with synonym" do
     begin
       Mime::Type.unregister :json
-      Mime::Type.register "application/json", :json, %w(application/vnd.api+json)
+      Mime::Type.register "application/json", :json, %w(application/vnd.rails+json)
       assert_parses(
         {"user" => {"username" => "meinac"}, "username" => "meinac"},
-        "{\"username\": \"meinac\"}", { 'CONTENT_TYPE' => 'application/vnd.api+json' }
+        "{\"username\": \"meinac\"}", { 'CONTENT_TYPE' => 'application/vnd.rails+json' }
       )
     ensure
       Mime::Type.unregister :json