diff --git a/lib/less/browser.js b/lib/less/browser.js
index aa95797..063a927 100644
--- a/lib/less/browser.js
+++ b/lib/less/browser.js
@@ -147,7 +147,7 @@ function createCSS(styles, sheet, lastModified) {
     var href = sheet.href ? sheet.href.replace(/\?.*$/, '') : '';
 
     // If there is no title set, use the filename, minus the extension
-    var id = 'less:' + (sheet.title || href.match(/(?:^|\/)([-\w]+)\.[a-z]+$/i)[1]);
+    var id = 'less:' + (sheet.title || href.match(/(?:^|\/)([-\w.]+)\.[a-z]+$/i)[1]);
 
     // If the stylesheet doesn't exist, create a new node
     if ((css = document.getElementById(id)) === null) {