diff --git a/lib/creole/parser.rb b/lib/creole/parser.rb
index 9281c2b..0593b3b 100644
--- a/lib/creole/parser.rb
+++ b/lib/creole/parser.rb
@@ -57,6 +57,7 @@ def no_escape?; @no_escape; end
     def initialize(text, options = {})
       @allowed_schemes = %w(http https ftp ftps)
       @text            = text
+      @extensions = @no_escape = nil
       options.each_pair {|k,v| send("#{k}=", v) }
     end