diff --git a/lib/less/tree/url.js b/lib/less/tree/url.js
index 62549ead..02d34855 100644
--- a/lib/less/tree/url.js
+++ b/lib/less/tree/url.js
@@ -2,10 +2,8 @@
 
 tree.URL = function (val, paths) {
     // Add the base path if the URL is relative and we are in the browser
-    if (!/^(?:http:\/)?\//.test(val.value) &&
-        paths.length > 0                   &&
-        typeof(window) !== 'undefined') {
-        val.value = [paths[0], val.value].join('/');
+    if (!/^(?:http:\/)?\//.test(val.value) && paths.length > 0 && typeof(window) !== 'undefined') {
+        val.value = [paths[0], val.value].join('/').replace('//', '/');
     }
     this.value = val;
 };