diff --git a/test/unit/wiki_test.rb b/test/unit/wiki_test.rb
index 923ff528e..4b6f817ed 100644
--- a/test/unit/wiki_test.rb
+++ b/test/unit/wiki_test.rb
@@ -78,8 +78,10 @@ class WikiTest < ActiveSupport::TestCase
   end
 
   def test_titleize
+    ja_test = "\xe3\x83\x86\xe3\x82\xb9\xe3\x83\x88"
+    ja_test.force_encoding('UTF-8') if ja_test.respond_to?(:force_encoding)
     assert_equal 'Page_title_with_CAPITALES', Wiki.titleize('page title with CAPITALES')
-    assert_equal 'テスト', Wiki.titleize('テスト')
+    assert_equal ja_test, Wiki.titleize(ja_test)
   end
 
   context "#sidebar" do