diff --git a/java_in_ruby.rb b/java_in_ruby.rb
index 761f848..a263dc8 100644
--- a/java_in_ruby.rb
+++ b/java_in_ruby.rb
@@ -8,10 +8,8 @@ def main(arg)   ; yield   ; end
 
 System = OpenStruct.new(out: STDOUT)
 
-class IO
-  def println(str)
-    puts str
-  end
+def STDOUT.println(str)
+  puts str
 end
 
 public static void main(String args[]){