diff --git a/web/viewer.js b/web/viewer.js
index 1f23ba708..225e95ac9 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -1785,7 +1785,7 @@ var PDFView = {
       var param = parts[i].split('=');
       var key = param[0];
       var value = param.length > 1 ? param[1] : null;
-      params[unescape(key)] = unescape(value);
+      params[decodeURIComponent(key)] = decodeURIComponent(value);
     }
     return params;
   },