diff --git a/lib/Cake/I18n/L10n.php b/lib/Cake/I18n/L10n.php
index da2f012cb..f8e281932 100644
--- a/lib/Cake/I18n/L10n.php
+++ b/lib/Cake/I18n/L10n.php
@@ -137,6 +137,7 @@ class L10n {
 		/* Latvian */ 'lav' => 'lv',
 		/* Limburgish */ 'lim' => 'li',
 		/* Lithuanian */ 'lit' => 'lt',
+		/* Luxembourgish */ 'ltz' => 'lb',
 		/* Macedonian */ 'mkd' => 'mk',
 		/* Macedonian - bibliographic */ 'mac' => 'mk',
 		/* Malaysian */ 'msa' => 'ms',
@@ -284,6 +285,7 @@ class L10n {
 		'ko-kp' => array('language' => 'Korea (North)', 'locale' => 'ko_kp', 'localeFallback' => 'kor', 'charset' => 'kr', 'direction' => 'ltr'),
 		'ko-kr' => array('language' => 'Korea (South)', 'locale' => 'ko_kr', 'localeFallback' => 'kor', 'charset' => 'kr', 'direction' => 'ltr'),
 		'koi8-r' => array('language' => 'Russian', 'locale' => 'koi8_r', 'localeFallback' => 'rus', 'charset' => 'koi8-r', 'direction' => 'ltr'),
+		'lb' => array('language' => 'Luxembourgish', 'locale' => 'ltz', 'localeFallback' => 'ltz', 'charset' => 'utf-8', 'direction' => 'ltr'),
 		'li' => array('language' => 'Limburgish', 'locale' => 'lim', 'localeFallback' => 'nld', 'charset' => 'utf-8', 'direction' => 'ltr'),
 		'lt' => array('language' => 'Lithuanian', 'locale' => 'lit', 'localeFallback' => 'lit', 'charset' => 'utf-8', 'direction' => 'ltr'),
 		'lv' => array('language' => 'Latvian', 'locale' => 'lav', 'localeFallback' => 'lav', 'charset' => 'utf-8', 'direction' => 'ltr'),