diff --git a/lib/rx-file.rb b/lib/rx-file.rb
index 23ebbf8..a52ea21 100644
--- a/lib/rx-file.rb
+++ b/lib/rx-file.rb
@@ -13,6 +13,11 @@ require_relative "rx-file/array_node"
 require_relative "rx-file/hash_node"
 require_relative "rx-file/occurence"
 
+Object.class_eval do
+  def to_rxf
+    RxFile.write(self)
+  end
+end
 Class.class_eval do
   def to_rxf
     self.name
diff --git a/test/helper.rb b/test/helper.rb
index 5454f66..a269bbf 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -13,7 +13,7 @@ require 'rx-file'
 
 module Checker
   def check should
-    out = RxFile.write(@out)
+    out = @out.to_rxf
     same = (should == out)
     puts "Shouldda\n#{out}" unless same
     assert_equal should , out