diff --git a/zipline/protocol.py b/zipline/protocol.py
index 6c89896c..f4b57e74 100644
--- a/zipline/protocol.py
+++ b/zipline/protocol.py
@@ -63,6 +63,9 @@ class Portfolio(object):
         if initial_values:
             self.__dict__ = initial_values
 
+    def __getattr__(self, key):
+        return self.__dict__[key]
+
     def __repr__(self):
         return "Portfolio({0})".format(self.__dict__)