diff --git a/lib/index-web.js b/lib/index-web.js
index 5cb8c9c57..11faeb1f1 100644
--- a/lib/index-web.js
+++ b/lib/index-web.js
@@ -44,7 +44,7 @@ module.exports = function(config, auth, storage) {
     template = Handlebars.compile(fs.readFileSync(require.resolve('./GUI/index.hbs'), 'utf8'));
   }
   app.get('/', function(req, res, next) {
-    let base = Utils.get_base_url(req.protocol, req.get('host'), config.url_prefix);
+    let base = Utils.combineBaseUrl(req.protocol, req.get('host'), config.url_prefix);
     res.setHeader('Content-Type', 'text/html');
 
     storage.get_local(function(err, packages) {
diff --git a/lib/utils.js b/lib/utils.js
index 5054cd0d4..3515f0ea6 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -87,14 +87,14 @@ function validate_metadata(object, name) {
  * @param {String} prefix
  * @return {String} base registry url
  */
-function get_base_url(protocol, host, prefix) {
-	let result = protocol + '://' + host;
+function combineBaseUrl(protocol, host, prefix) {
+	let result = '@{protocol}://@{host}';
 
 	if (prefix) {
 		prefix = prefix.replace(/\/$/, '');
 
 		result = (prefix.indexOf('/') === 0)
-			? result + prefix
+			? '@{result}@{prefix}'
 			: prefix;
 	}
 
@@ -119,7 +119,7 @@ function filter_tarball_urls(pkg, req, config) {
 			return _url;
 		}
 		const filename = URL.parse(_url).pathname.replace(/^.*\//, '');
-		const base = get_base_url(req.protocol, req.headers.host, config.url_prefix);
+		const base = combineBaseUrl(req.protocol, req.headers.host, config.url_prefix);
 
 		return `${base}/${pkg.name.replace(/\//g, '%2f')}/-/${filename}`;
 	};
@@ -280,7 +280,7 @@ module.exports.parse_address = parse_address;
 module.exports.get_version = get_version;
 module.exports.normalize_dist_tags = normalize_dist_tags;
 module.exports.tag_version = tag_version;
-module.exports.get_base_url = get_base_url;
+module.exports.combineBaseUrl = combineBaseUrl;
 module.exports.filter_tarball_urls = filter_tarball_urls;
 module.exports.validate_metadata = validate_metadata;
 module.exports.is_object = is_object;