diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index c2fc4e94c6..3abfe663e5 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1,7 +1,7 @@
 require 'test/unit'
 require_relative 'envutil'
 
-require "refinement"
+EnvUtil.suppress_warning {require "refinement"}
 
 class TestRefinement < Test::Unit::TestCase
   class Foo