diff --git a/django/http/__init__.py b/django/http/__init__.py
index 60b6d15795..812a0fdfa1 100644
--- a/django/http/__init__.py
+++ b/django/http/__init__.py
@@ -189,7 +189,7 @@ class QueryDict(MultiValueDict):
         for key, value in dict.items(self):
             dict.__setitem__(result, copy.deepcopy(key, memo), copy.deepcopy(value, memo))
         return result
-
+    
     def setlist(self, key, list_):
         self._assert_mutable()
         key = str_to_unicode(key, self.encoding)
diff --git a/django/utils/datastructures.py b/django/utils/datastructures.py
index 5837c3d236..d0cd9085dd 100644
--- a/django/utils/datastructures.py
+++ b/django/utils/datastructures.py
@@ -222,7 +222,18 @@ class MultiValueDict(dict):
             dict.__setitem__(result, copy.deepcopy(key, memo),
                              copy.deepcopy(value, memo))
         return result
-
+    
+    def __getstate__(self):
+        obj_dict = self.__dict__.copy()
+        obj_dict['_data'] = dict([(k, self.getlist(k)) for k in self])
+        return obj_dict
+    
+    def __setstate__(self, obj_dict):
+        data = obj_dict.pop('_data', {})
+        for k, v in data.items():
+            self.setlist(k, v)
+        self.__dict__.update(obj_dict)
+        
     def get(self, key, default=None):
         """
         Returns the last data value for the passed key. If key doesn't exist
diff --git a/tests/regressiontests/httpwrappers/tests.py b/tests/regressiontests/httpwrappers/tests.py
index 844b356366..15b872821c 100644
--- a/tests/regressiontests/httpwrappers/tests.py
+++ b/tests/regressiontests/httpwrappers/tests.py
@@ -396,10 +396,18 @@ u'\ufffd'
 # Pickling a QueryDict #
 ########################
 >>> import pickle
+>>> q = QueryDict('')
+>>> q1 = pickle.loads(pickle.dumps(q, 2))
+>>> q == q1
+True
 >>> q = QueryDict('a=b&c=d')
 >>> q1 = pickle.loads(pickle.dumps(q, 2))
 >>> q == q1
 True
+>>> q = QueryDict('a=b&c=d&a=1') 
+>>> q1 = pickle.loads(pickle.dumps(q, 2))
+>>> q == q1 
+True
 
 ######################################
 # HttpResponse with Unicode headers  #