diff --git a/lib/less/browser.js b/lib/less/browser.js
index 2af3cfbc..2123e485 100644
--- a/lib/less/browser.js
+++ b/lib/less/browser.js
@@ -214,7 +214,7 @@ function extractUrlParts(url, baseUrl) {
         if (!baseUrlParts) {
             throw new Error("Could not parse page url - '"+baseUrl+"'");
         }
-        urlParts[1] = baseUrlParts[1];
+        urlParts[1] = baseUrlParts[1] || "";
         if (!urlParts[2]) {
             urlParts[3] = baseUrlParts[3] + urlParts[3];
         }