diff --git a/oauth3.implicit.js b/oauth3.implicit.js
index ddf7b03..449508a 100644
--- a/oauth3.implicit.js
+++ b/oauth3.implicit.js
@@ -144,9 +144,9 @@
         , signature: parts[2] // should remain url-safe base64
         };
       }
-    , getFreshness: function (tokenMeta, staletime, now) {
+    , freshness: function (tokenMeta, staletime, _now) {
         staletime = staletime || (15 * 60);
-        now = now || Date.now();
+        var now = _now || Date.now();
         var fresh = ((parseInt(tokenMeta.exp, 10) || 0) - Math.round(now / 1000));
 
         if (fresh >= staletime) {