diff --git a/ractor.c b/ractor.c
index 43a7f6c140..8e7f7d6497 100644
--- a/ractor.c
+++ b/ractor.c
@@ -216,6 +216,8 @@ ractor_mark(void *ptr)
     rb_gc_mark(r->r_stdin);
     rb_gc_mark(r->r_stdout);
     rb_gc_mark(r->r_stderr);
+    rb_gc_mark(r->verbose);
+    rb_gc_mark(r->debug);
     rb_hook_list_mark(&r->pub.hooks);
 
     if (r->threads.cnt > 0) {
diff --git a/test/ruby/test_rubyoptions.rb b/test/ruby/test_rubyoptions.rb
index 8126cb3c26..527208cee5 100644
--- a/test/ruby/test_rubyoptions.rb
+++ b/test/ruby/test_rubyoptions.rb
@@ -530,6 +530,8 @@ class TestRubyOptions < Test::Unit::TestCase
 
     assert_in_out_err(%w(- -#=foo), "#!ruby -s\n", [],
                       /invalid name for global variable - -# \(NameError\)/)
+
+    assert_in_out_err(['-s', '-e', 'GC.start; p $DEBUG', '--', '-DEBUG=x'], "", ['"x"'])
   end
 
   def test_option_missing_argument