diff --git a/core/control/Director.php b/core/control/Director.php
index cf6927783..78337c724 100755
--- a/core/control/Director.php
+++ b/core/control/Director.php
@@ -662,7 +662,7 @@ class Director {
 	 */
 	static function forceWWW() {
 		if(!Director::isDev() && !Director::isTest() && strpos($_SERVER['HTTP_HOST'], 'www') !== 0) {
-			str_replace(Director::protocol(), Director::protocol() . 'www.', Director::absoluteURL($_SERVER['REQUEST_URI']));
+			$destURL = str_replace(Director::protocol(), Director::protocol() . 'www.', Director::absoluteURL($_SERVER['REQUEST_URI']));
 
 			header("Location: $destURL", true, 301);
 			die("<h1>Your browser is not accepting header redirects</h1><p>Please <a href=\"$destURL\">click here</a>");