diff --git a/passpal.rb b/passpal.rb
index 4deb7b2..f7da623 100644
--- a/passpal.rb
+++ b/passpal.rb
@@ -311,7 +311,7 @@ def initialize
   end
   def analyze(word)
     if Regexp.new('^[a-zA-Z0-9\p{Punct} ]+$'.force_encoding('utf-8'), Regexp::FIXEDENCODING).match(word)
-      word.tr!('A-Za-z0-9'+'!"#$%&\'()*+,\-./:;<=>?@[]^_`{|}~ ', 'U'*26+'L'*26+'D'*10+'S'*33)
+      word.tr!('A-Za-z0-9'+'!"#$%&\'()*+,\\-./:;<=>?@[]^_`{|}~ ', 'U'*26+'L'*26+'D'*10+'S'*33)
       @results[LUDS::encode(word).to_sym] += 1
     else
       @otherCount += 1