diff --git a/lib/v8/object.rb b/lib/v8/object.rb
index 71f6281..30b66f2 100644
--- a/lib/v8/object.rb
+++ b/lib/v8/object.rb
@@ -52,7 +52,7 @@ class V8::Object
     end
   end
 
-  def respond_to?(method)
+  def respond_to?(method, include_all=false)
     super or self[method] != nil
   end
 
@@ -76,4 +76,4 @@ class V8::Object
       raise ArgumentError, "wrong number of arguments (#{args.length} for 0)" unless args.empty?
     end
   end
-end
\ No newline at end of file
+end