diff --git a/lib/client.js b/lib/client.js
index ea2b3ed..3008dcb 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -854,7 +854,7 @@ Client.prototype.https = function(filename){
 
 Client.prototype.signedUrl = function(filename, expiration, options){
   var epoch = Math.floor(expiration.getTime()/1000)
-    , pathname = url.parse(filename).pathname
+    , pathname = url.parse(encodeSpecialCharacters(filename)).pathname
     , resource = '/' + this.bucket + ensureLeadingSlash(pathname);
 
   if (options && options.qs) {