diff --git a/mule-uploader.js b/mule-uploader.js
index 2985306..f197585 100644
--- a/mule-uploader.js
+++ b/mule-uploader.js
@@ -755,7 +755,7 @@
                 };
             }
 
-            var host = "s3" + util.region_string(u.settings.auth.region) + ".amazonaws.com";
+            var host = "s3" + utils.region_string(u.settings.auth.region) + ".amazonaws.com";
             var url = location.protocol + "//" + host + "/" + u.settings.auth.bucket + "/" + path;
             XHR({
                 url: url,
@@ -1295,7 +1295,7 @@
             // given an AWS region, it either returns an empty string for US-based regions
             // or the region name preceded by a dash for non-US-based regions
             // see this for more details: http://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html
-            if(region && region.slice(0,2) !== 'us') {
+            if(region && region !== 'us-east-1') {
                 return '-' + region;
             }
             return '';