diff --git a/zipline/finance/blotter.py b/zipline/finance/blotter.py
index 0553bbce..11b22d4f 100644
--- a/zipline/finance/blotter.py
+++ b/zipline/finance/blotter.py
@@ -251,10 +251,6 @@ class Blotter(SerializeableZiplineObject):
 
             yield txn, order
 
-    def __getinitargs__(self):
-        # Ensure that init is called on deserialization
-        return ()
-
     def __getstate__(self):
 
         state_to_save = ['new_orders', 'orders', '_status']
@@ -272,6 +268,8 @@ class Blotter(SerializeableZiplineObject):
 
     def __setstate__(self, state):
 
+        self.__init__()
+
         OLDEST_SUPPORTED_STATE = 1
         version = state.pop(VERSION_LABEL)
 
diff --git a/zipline/finance/performance/position.py b/zipline/finance/performance/position.py
index 9e309683..f8bfb11a 100644
--- a/zipline/finance/performance/position.py
+++ b/zipline/finance/performance/position.py
@@ -38,6 +38,8 @@ from math import (
     floor,
 )
 
+from copy import copy
+
 import logbook
 import zipline.protocol as zp
 
@@ -214,7 +216,7 @@ last_sale_price: {last_sale_price}"
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION
diff --git a/zipline/finance/slippage.py b/zipline/finance/slippage.py
index 59109c38..da9b6d42 100644
--- a/zipline/finance/slippage.py
+++ b/zipline/finance/slippage.py
@@ -134,7 +134,7 @@ class Transaction(SerializeableZiplineObject):
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION
@@ -271,7 +271,7 @@ class VolumeShareSlippage(SlippageModel, SerializeableZiplineObject):
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION
@@ -309,7 +309,7 @@ class FixedSlippage(SlippageModel, SerializeableZiplineObject):
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION
diff --git a/zipline/protocol.py b/zipline/protocol.py
index 84294dad..8d3e0e46 100644
--- a/zipline/protocol.py
+++ b/zipline/protocol.py
@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from copy import copy
+
 from six import iteritems, iterkeys
 import pandas as pd
 import numpy as np
@@ -144,7 +146,7 @@ class Portfolio(SerializeableZiplineObject):
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION
@@ -196,7 +198,7 @@ class Account(SerializeableZiplineObject):
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION
@@ -230,7 +232,7 @@ class Position(SerializeableZiplineObject):
 
     def __getstate__(self):
 
-        state_dict = self.__dict__
+        state_dict = copy(self.__dict__)
 
         STATE_VERSION = 1
         state_dict[VERSION_LABEL] = STATE_VERSION