diff --git a/lib/sanitize.rb b/lib/sanitize.rb
index a747440a..6bc6d6a1 100644
--- a/lib/sanitize.rb
+++ b/lib/sanitize.rb
@@ -133,7 +133,9 @@ class String
          [\x09\x0A\x0D\x20-\x7E]            # ASCII
        | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
        |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
-       | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
+       | [\xE1-\xEC\xEE][\x80-\xBF]{2}      # straight 3-byte
+       |  \xEF[\x80-\xBE]{2}                # 
+       |  \xEF\xBF[\x80-\xBD]               # excluding U+fffe and U+ffff
        |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
        |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
        | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15