diff --git a/lib/Cake/Test/Case/View/Helper/FormHelperTest.php b/lib/Cake/Test/Case/View/Helper/FormHelperTest.php
index bd0dbb2c8..a1ef2cd9e 100644
--- a/lib/Cake/Test/Case/View/Helper/FormHelperTest.php
+++ b/lib/Cake/Test/Case/View/Helper/FormHelperTest.php
@@ -3902,6 +3902,25 @@ class FormHelperTest extends CakeTestCase {
 			'/fieldset'
 		);
 		$this->assertTags($result, $expected);
+
+		$result = $this->Form->radio(
+			'Model.multibyte',
+			array('男性' => '男性')
+		);
+		$expected = array(
+			'input' => array(
+				'type' => 'hidden', 'name' => 'data[Model][multibyte]',
+				'id' => 'ModelMultibyte_', 'value' => '',
+			),
+			array('input' => array(
+				'type' => 'radio', 'name' => 'data[Model][multibyte]',
+				'id' => 'ModelMultibyte男性', 'value' => '男性')
+			),
+			array('label' => array('for' => 'ModelMultibyte男性')),
+			'男性',
+			'/label',
+		);
+		$this->assertTags($result, $expected);
 	}
 
 /**
diff --git a/lib/Cake/Utility/Inflector.php b/lib/Cake/Utility/Inflector.php
index 594556b60..426334fa5 100644
--- a/lib/Cake/Utility/Inflector.php
+++ b/lib/Cake/Utility/Inflector.php
@@ -495,7 +495,12 @@ class Inflector {
  */
 	public static function humanize($lowerCaseAndUnderscoredWord) {
 		if (!($result = self::_cache(__FUNCTION__, $lowerCaseAndUnderscoredWord))) {
-			$result = ucwords(str_replace('_', ' ', $lowerCaseAndUnderscoredWord));
+			$result = str_replace('_', ' ', $lowerCaseAndUnderscoredWord);
+			if (function_exists('mb_convert_case') && Multibyte::checkMultibyte($result)) {
+				$result = mb_convert_case($result, MB_CASE_TITLE, Configure::read('App.encoding'));
+			} else {
+				$result = ucwords($result);
+			}
 			self::_cache(__FUNCTION__, $lowerCaseAndUnderscoredWord, $result);
 		}
 		return $result;