diff --git a/lib/postrank-uri.rb b/lib/postrank-uri.rb
index ab845b0..7b55f1b 100644
--- a/lib/postrank-uri.rb
+++ b/lib/postrank-uri.rb
@@ -133,7 +133,7 @@ def unescape(uri)
       u = parse(uri)
       u.query = u.query.tr('+', ' ') if u.query
       u.to_s.gsub(URIREGEX[:unescape]) do |encoded|
-        if encoded.match? URIREGEX[:reserved_characters]
+        if !encoded.match(URIREGEX[:reserved_characters]).nil?
           encoded
         else
           [encoded.delete('%')].pack('H*')