diff --git a/war/src/main/webapp/scripts/hudson-behavior.js b/war/src/main/webapp/scripts/hudson-behavior.js
index 9fdfec4f53..de41720260 100644
--- a/war/src/main/webapp/scripts/hudson-behavior.js
+++ b/war/src/main/webapp/scripts/hudson-behavior.js
@@ -2775,20 +2775,6 @@ var toggleCheckboxes = function(toggle) {
     }
 };
 
-// this used to be in prototype.js but it must have been removed somewhere between 1.4.0 to 1.5.1
-String.prototype.trim = function() {
-    var temp = this;
-    var obj = /^(\s*)([\W\w]*)(\b\s*$)/;
-    if (obj.test(temp))
-        temp = temp.replace(obj, '$2');
-    obj = /  /g;
-    while (temp.match(obj))
-        temp = temp.replace(obj, " ");
-    return temp;
-}
-
-
-
 var hoverNotification = (function() {
     var msgBox;
     var body;