private_instance_methods returns symbols in 1.9

test/fake/symlink_test.rb

@@ -6,6 +6,7 @@ class FakeSymlinkTest < Test::Unit::TestCase
   include FakeFS
 
   def test_symlink_has_method_missing_as_private
-    assert FakeSymlink.private_instance_methods.include?("method_missing")
+    methods = FakeSymlink.private_instance_methods.map { |m| m.to_s }
+    assert methods.include?("method_missing")
   end
 end