diff --git a/src/lib/jar.js b/src/lib/jar.js
index 035d17afd..343a3befa 100644
--- a/src/lib/jar.js
+++ b/src/lib/jar.js
@@ -71,6 +71,7 @@ var Jar = {
         });
     },
     set: function (name, value, opts) {
+        opts = opts || {};
         defaults(opts, {
             expires: new Date(new Date().setYear(new Date().getFullYear() + 1))
         });