diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index a1514ed853..d5b4a1b612 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -851,7 +851,7 @@ class TestObject < Test::Unit::TestCase
 
   def test_copied_ivar_memory_leak
     bug10191 = '[ruby-core:64700] [Bug #10191]'
-    assert_no_memory_leak([], <<-"end;", <<-"end;", bug10191, rss: true, timeout: 60, limit: 1.8)
+    assert_no_memory_leak([], <<-"end;", <<-"end;", bug10191, timeout: 60, limit: 1.8)
       def (a = Object.new).set; @v = nil; end
       num = 500_000
     end;