diff --git a/CHANGELOG.md b/CHANGELOG.md
index 283a2f7543..ebeb9fc45f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## 2.7.10 - Unreleased
 
 * Added support for user data to Amazon Elastic Transcoder.
+* Corrected the AWS Security Token Service endpoint. 
 
 ## 2.7.9 - 2014-12-08
 
diff --git a/src/Aws/Common/Resources/public-endpoints.php b/src/Aws/Common/Resources/public-endpoints.php
index f24f3404f2..dd272f77d3 100644
--- a/src/Aws/Common/Resources/public-endpoints.php
+++ b/src/Aws/Common/Resources/public-endpoints.php
@@ -13,7 +13,7 @@
             'endpoint' => 'iam.us-gov.amazonaws.com'
         ),
         'us-gov-west-1/sts' => array(
-            'endpoint' => 'sts.us-gov.amazonaws.com'
+            'endpoint' => 'sts.us-gov-west-1.amazonaws.com'
         ),
         'us-gov-west-1/s3' => array(
             'endpoint' => 's3-{region}.amazonaws.com'