diff --git a/Rakefile b/Rakefile
index 2c085058a..1b5d91615 100644
--- a/Rakefile
+++ b/Rakefile
@@ -13,7 +13,7 @@ task :build_advanced do
   # remove wrapping anonymous function as this messes with closure compiler
   # see
   # http://groups.google.com/group/closure-compiler-discuss/browse_thread/thread/b59b54c1a0073aa5
-  js.sub!('(function() {', '').chomp!("})();\n")
+  js.sub!('(function() {', '').chomp!("_.initWrapper();\n})();\n")
   compiler = Closure::Compiler.new \
     :compilation_level => 'ADVANCED_OPTIMIZATIONS', 
     :formatting => 'PRETTY_PRINT'
diff --git a/underscore.js b/underscore.js
index 53d70c503..6260b57b8 100644
--- a/underscore.js
+++ b/underscore.js
@@ -697,5 +697,6 @@
     };
   }
   
+  // For backwards compatability, init the OO wrapper
   _.initWrapper();
 })();