diff --git a/lib/Cake/Network/CakeResponse.php b/lib/Cake/Network/CakeResponse.php
index 41cb0f412c9..baa97996dfd 100644
--- a/lib/Cake/Network/CakeResponse.php
+++ b/lib/Cake/Network/CakeResponse.php
@@ -350,10 +350,9 @@ public function send() {
 		$codeMessage = $this->_statusCodes[$this->_status];
 		$this->_sendHeader("{$this->_protocol} {$this->_status} {$codeMessage}");
 		$this->_sendHeader('Content-Type', "{$this->_contentType}; charset={$this->_charset}");
-		$shouldSetLength = empty($this->_headers['Content-Length']) && class_exists('Multibyte');
-		$shouldSetLength = $shouldSetLength && !in_array($this->_status, range(301, 307));
+		$shouldSetLength = empty($this->_headers['Content-Length']) && !in_array($this->_status, range(301, 307));
 		if ($shouldSetLength && !$this->outputCompressed()) {
-			$this->_headers['Content-Length'] = mb_strlen($this->_body);
+			$this->_headers['Content-Length'] = strlen($this->_body);
 		}
 		foreach ($this->_headers as $header => $value) {
 			$this->_sendHeader($header, $value);
diff --git a/lib/Cake/Test/Case/Network/CakeResponseTest.php b/lib/Cake/Test/Case/Network/CakeResponseTest.php
index c118fd62e32..74b29573e68 100644
--- a/lib/Cake/Test/Case/Network/CakeResponseTest.php
+++ b/lib/Cake/Test/Case/Network/CakeResponseTest.php
@@ -396,7 +396,7 @@ public function testSendContentLength() {
 		$response->expects($this->at(1))
 			->method('_sendHeader')->with('Content-Type', 'text/html; charset=UTF-8');
 		$response->expects($this->at(2))
-			->method('_sendHeader')->with('Content-Length', mb_strlen($body));
+			->method('_sendHeader')->with('Content-Length', 116);
 		$response->send();
 
 		$response = $this->getMock('CakeResponse', array('_sendHeader', '_sendContent', 'outputCompressed'));