diff --git a/wp-admin/js/common.js b/wp-admin/js/common.js
index 629f09a8cb..67e38d81ac 100644
--- a/wp-admin/js/common.js
+++ b/wp-admin/js/common.js
@@ -1,5 +1,5 @@
 
-wpCookies = {
+var wpCookies = {
 // The following functions are from Cookie.js class in TinyMCE, Moxiecode, used under LGPL.
 
 	each : function(o, cb, s) {
diff --git a/wp-admin/js/editor.js b/wp-admin/js/editor.js
index d39f5ac945..935267a286 100644
--- a/wp-admin/js/editor.js
+++ b/wp-admin/js/editor.js
@@ -1,5 +1,5 @@
 
-switchEditors = {
+var switchEditors = {
 
 	mode : '',
 
@@ -169,4 +169,4 @@ switchEditors = {
 
 		return pee;
 	}
-}
+};
diff --git a/wp-includes/js/wp-ajax-response.js b/wp-includes/js/wp-ajax-response.js
index 95558536d2..d941f2179e 100644
--- a/wp-includes/js/wp-ajax-response.js
+++ b/wp-includes/js/wp-ajax-response.js
@@ -1,4 +1,4 @@
-wpAjax = jQuery.extend( {
+var wpAjax = jQuery.extend( {
 	unserialize: function( s ) {
 		var r = {}; if ( !s ) { return r; }
 		var q = s.split('?'); if ( q[1] ) { s = q[1]; }