diff --git a/lib/less/browser.js b/lib/less/browser.js
index cdcff5a..310e5ce 100644
--- a/lib/less/browser.js
+++ b/lib/less/browser.js
@@ -146,10 +146,11 @@ function loadStyleSheet(sheet, callback, reload, remaining) {
 }
 
 function extractId(href) {
-    return href.replace(/^[a-z]+:\/\/?/, '')   // Remove protocol
-               .replace(/\?.*$/,         '')   // Remove query
-               .replace(/\.[^\/]+$/,     '')   // Remove file extension
-               .replace(/[^\w-]+/g,      '-'); // Replace illegal characters
+    return href.replace(/^[a-z]+:\/\/?[^\/]+/, '')  // Remove protocol & domain
+               .replace(/^\//,                 '')  // Remove root /
+               .replace(/\?.*$/,               '')  // Remove query
+               .replace(/\.[^\/]+$/,           '')  // Remove file extension
+               .replace(/[^\w-]+/g,           '-'); // Replace illegal characters
 }
 
 function createCSS(styles, sheet, lastModified) {