diff --git a/test/test_text_check.rb b/test/test_text_check.rb
index d4076edf..ba12fda2 100644
--- a/test/test_text_check.rb
+++ b/test/test_text_check.rb
@@ -85,7 +85,7 @@ def test_character_reference_hex_surrogate_block
 
       def test_entity_name_non_ascii_symbol
         # U+00BF INVERTED QUESTION MARK
-        assert_check_failed('&\u00BF;', '&')
+        assert_check_failed("&\u00BF;", '&')
       end
     end
   end