diff --git a/trade.py b/trade.py
index 9b88ad5a..4e033d2b 100644
--- a/trade.py
+++ b/trade.py
@@ -46,7 +46,7 @@ class DummyMFD(object):
     def __init__(self):
         pass
 
-    def update(self, *args):
+    def update(self, *args, **kwargs):
         pass
 
     def finish(self):