diff --git a/4chan_x.user.js b/4chan_x.user.js
index cda86656f..2ea4bdef7 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -173,17 +173,6 @@
 
   log = typeof (_base = console.log).bind === "function" ? _base.bind(console) : void 0;
 
-  if (!Object.keys) {
-    Object.keys = function(o) {
-      var key, _results;
-      _results = [];
-      for (key in o) {
-        _results.push(key);
-      }
-      return _results;
-    };
-  }
-
   conf = {};
 
   (flatten = function(parent, obj) {
diff --git a/script.coffee b/script.coffee
index 58e19d543..0996d7256 100644
--- a/script.coffee
+++ b/script.coffee
@@ -103,11 +103,6 @@ config =
 # XXX GreaseMonkey can't into console.log.bind
 log = console.log.bind? console
 
-# XXX opera cannot into Object.keys
-if not Object.keys
-  Object.keys = (o) ->
-    key for key of o
-
 # flatten the config
 conf = {}
 (flatten = (parent, obj) ->