diff --git a/activesupport/test/core_ext/kernel_test.rb b/activesupport/test/core_ext/kernel_test.rb
index 70e1e664a0..444bf9538a 100644
--- a/activesupport/test/core_ext/kernel_test.rb
+++ b/activesupport/test/core_ext/kernel_test.rb
@@ -60,7 +60,7 @@ class KernelTest < ActiveSupport::TestCase
 
   def test_require_library_or_gem_deprecated
     assert_deprecated do
-      require_library_or_gem 'i18n'
+      require_library_or_gem 'multi_json'
     end
   end
 end