diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 82e2128358..117e4c95d6 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -548,6 +548,7 @@ class TestIO < Test::Unit::TestCase
 
   if have_nonblock?
     def test_copy_stream_no_busy_wait
+      skip "MJIT has busy wait on GC. This sometimes fails with --jit." if RubyVM::MJIT.enabled?
       skip "multiple threads already active" if Thread.list.size > 1
 
       msg = 'r58534 [ruby-core:80969] [Backport #13533]'