diff --git a/device/index.js b/device/index.js
index 4fcd96f..95913ae 100644
--- a/device/index.js
+++ b/device/index.js
@@ -512,7 +512,7 @@ function DeviceClient(options) {
       }
 
       if (!isUndefined(options.host) && isUndefined(options.region)) {
-         var pattern = /[a-zA-Z0-9]+\.iot\.([a-z]+-[a-z]+-[0-9]+)\.amazonaws\..+/;
+         var pattern = /[a-zA-Z0-9]+\.iot\.([a-z]+[-[a-z]+]*-[a-z]+-[0-9]+)\.amazonaws\..+/;
          var region = pattern.exec(options.host);
          if (region === null) {
             console.log('Host endpoint is not valid');