diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index b168683368..66251b9fb0 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -1716,10 +1716,10 @@ class TestArray < Test::Unit::TestCase
   def test_slice_gc_compact_stress
     omit "compaction doesn't work well on s390x" if RUBY_PLATFORM =~ /s390x/ # https://github.com/ruby/ruby/pull/5077
     EnvUtil.under_gc_compact_stress { assert_equal([1, 2, 3, 4, 5], (0..10).to_a[1, 5]) }
-    # EnvUtil.under_gc_compact_stress do
-    #   a = [0, 1, 2, 3, 4, 5]
-    #   assert_equal([2, 1, 0], a.slice((2..).step(-1)))
-    # end
+    EnvUtil.under_gc_compact_stress do
+      a = [0, 1, 2, 3, 4, 5]
+      assert_equal([2, 1, 0], a.slice((2..).step(-1)))
+    end
   end
 
   def test_slice!