diff --git a/src/prototype/deprecated.js b/src/prototype/deprecated.js
index 6859bd96f..16e7e682a 100644
--- a/src/prototype/deprecated.js
+++ b/src/prototype/deprecated.js
@@ -193,8 +193,8 @@ Object.extend(Element.ClassNames.prototype, Enumerable);
  *  A class that queries the document for elements that match a given CSS
  *  selector.
 **/
-(function() {
-  window.Selector = Class.create({
+var Selector = (function() {
+  var Selector = Class.create({
     /** deprecated
      *  new Selector(expression)
      *  - expression (String): A CSS selector.
@@ -288,4 +288,5 @@ Object.extend(Element.ClassNames.prototype, Enumerable);
       return Prototype.Selector.select(selector, element || document);
     }
   });
+  return Selector;
 })();
diff --git a/src/prototype/dom/selector.js b/src/prototype/dom/selector.js
index 37fdb7c8f..bdf8478d9 100644
--- a/src/prototype/dom/selector.js
+++ b/src/prototype/dom/selector.js
@@ -83,7 +83,7 @@
  *      $$('div:empty');
  *      // -> all DIVs without content (i.e., whitespace-only)
 **/
-window.$$ = function() {
+var $$ = function() {
   var expression = $A(arguments).join(', ');
   return Prototype.Selector.select(expression, document);
 };
diff --git a/vendor/sizzle/selector_engine.js b/vendor/sizzle/selector_engine.js
index 02a9e14d6..acd19921c 100644
--- a/vendor/sizzle/selector_engine.js
+++ b/vendor/sizzle/selector_engine.js
@@ -54,7 +54,7 @@ Prototype._original_property = window.Sizzle;
   Prototype.Selector.engine = engine;
   Prototype.Selector.select = select;
   Prototype.Selector.match = match;
-})(Sizzle);
+})(window.Sizzle);
 
 // Restore globals.
 window.Sizzle = Prototype._original_property;