diff --git a/Lib/weakref.py b/Lib/weakref.py
index 78b74ad..84d81a2 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -85,6 +85,17 @@
                 new[key] = o
         return new
 
+    __copy__ = copy
+
+    def __deepcopy__(self, memo):
+        from copy import deepcopy
+        new = self.__class__()
+        for key, wr in self.data.items():
+            o = wr()
+            if o is not None:
+                new[deepcopy(key, memo)] = o
+        return new
+
     def get(self, key, default=None):
         try:
             wr = self.data[key]
@@ -256,6 +267,17 @@
                 new[o] = value
         return new
 
+    __copy__ = copy
+
+    def __deepcopy__(self, memo):
+        from copy import deepcopy
+        new = self.__class__()
+        for key, value in self.data.items():
+            o = key()
+            if o is not None:
+                new[o] = deepcopy(value, memo)
+        return new
+
     def get(self, key, default=None):
         return self.data.get(ref(key),default)