diff --git a/lib/coffee-script/repl.js b/lib/coffee-script/repl.js
index c131e162..7c86ad8c 100644
--- a/lib/coffee-script/repl.js
+++ b/lib/coffee-script/repl.js
@@ -41,7 +41,7 @@
   };
 
   completeAttribute = function(text) {
-    var all, completions, match, obj, prefix, val;
+    var all, completions, key, match, obj, prefix, val;
     if (match = text.match(ACCESSOR)) {
       all = match[0], obj = match[1], prefix = match[2];
       try {
@@ -49,7 +49,14 @@
       } catch (error) {
         return;
       }
-      completions = getCompletions(prefix, Object.getOwnPropertyNames(Object(val)));
+      completions = getCompletions(prefix, (function() {
+        var _results;
+        _results = [];
+        for (key in Object(val)) {
+          _results.push(key);
+        }
+        return _results;
+      })());
       return [completions, prefix];
     }
   };
diff --git a/src/repl.coffee b/src/repl.coffee
index 756c50d9..92467e01 100644
--- a/src/repl.coffee
+++ b/src/repl.coffee
@@ -47,7 +47,7 @@ completeAttribute = (text) ->
       val = Script.runInThisContext obj
     catch error
       return
-    completions = getCompletions prefix, Object.getOwnPropertyNames Object val
+    completions = getCompletions prefix, (key for key of Object(val))
     [completions, prefix]
 
 # Attempt to autocomplete an in-scope free variable: `one`.