diff --git a/src/Credentials/EcsCredentialProvider.php b/src/Credentials/EcsCredentialProvider.php
index 0f377f2d98..61664dde5a 100644
--- a/src/Credentials/EcsCredentialProvider.php
+++ b/src/Credentials/EcsCredentialProvider.php
@@ -14,6 +14,7 @@ class EcsCredentialProvider
 {
     const SERVER_URI = 'http://169.254.170.2';
     const ENV_URI = "AWS_CONTAINER_CREDENTIALS_RELATIVE_URI";
+    const ENV_URI_FULL = "AWS_CONTAINER_CREDENTIALS_FULL_URI";
     const ENV_TIMEOUT = 'AWS_METADATA_SERVICE_TIMEOUT';
 
     /** @var callable */
@@ -84,12 +85,18 @@ public function __invoke()
      */
     private function getEcsUri()
     {
+        $fullCredsUri = getenv(self::ENV_URI_FULL);
+
+        if($fullCredsUri !== false){
+            return $fullCredsUri;
+        }
+
         $credsUri = getenv(self::ENV_URI);
 
         if ($credsUri === false) {
             $credsUri = isset($_SERVER[self::ENV_URI]) ? $_SERVER[self::ENV_URI] : '';
         }
-        
+
         return self::SERVER_URI . $credsUri;
     }