diff --git a/chance.rb b/chance.rb
index 84bf832..1d59eaa 100755
--- a/chance.rb
+++ b/chance.rb
@@ -25,6 +25,7 @@
 require 'optparse'
 require 'pp'
 require 'FileUtils'
+require 'rational'
 
 config = {}
 argparser = OptionParser.new {|opts|
@@ -186,4 +187,4 @@
 end
 
 
-File.open(config[:output] + "theme." + config[:extension], File::WRONLY|File::TRUNC|File::CREAT) {|f| f.write(final) }
\ No newline at end of file
+File.open(config[:output] + "theme." + config[:extension], File::WRONLY|File::TRUNC|File::CREAT) {|f| f.write(final) }