diff --git a/4chan_x.user.js b/4chan_x.user.js
index f0e683707..825bb5d67 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -168,10 +168,9 @@
   }
   if (!Object.keys) {
     Object.keys = function(o) {
-      var key, _i, _len, _results;
+      var key, _results;
       _results = [];
-      for (_i = 0, _len = o.length; _i < _len; _i++) {
-        key = o[_i];
+      for (key in o) {
         _results.push(key);
       }
       return _results;
diff --git a/script.coffee b/script.coffee
index b18d2ced3..c54ec8b5f 100644
--- a/script.coffee
+++ b/script.coffee
@@ -102,7 +102,7 @@ if console?
 # XXX opera cannot into Object.keys
 if not Object.keys
   Object.keys = (o) ->
-    key for key in o
+    key for key of o
 
 # flatten the config
 conf = {}