diff --git a/Lib/UserList.py b/Lib/UserList.py
index 348ea76cdba..7617a085bfb 100644
--- a/Lib/UserList.py
+++ b/Lib/UserList.py
@@ -71,5 +71,3 @@ def extend(self, other):
             self.data.extend(other.data)
         else:
             self.data.extend(other)
-
-collections.MutableSequence.register(UserList)
diff --git a/Lib/UserString.py b/Lib/UserString.py
index c3267ad7333..27b2b53d5a6 100755
--- a/Lib/UserString.py
+++ b/Lib/UserString.py
@@ -235,8 +235,6 @@ def __imul__(self, n):
     def insert(self, index, value):
         self[index:index] = value
 
-collections.MutableSequence.register(MutableString)
-
 if __name__ == "__main__":
     # execute the regression test to stdout, if called as a script:
     import os
diff --git a/Lib/collections.py b/Lib/collections.py
index d06445bcaa1..abde718d752 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -160,8 +160,6 @@ def fromkeys(cls, iterable, value=None):
             d[key] = value
         return d
 
-MutableMapping.register(UserDict)
-
 
 
 ################################################################################
diff --git a/Lib/weakref.py b/Lib/weakref.py
index b2546f72234..6c479a41ac0 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -194,7 +194,6 @@ def values(self):
                 L.append(o)
         return L
 
-collections.MutableMapping.register(WeakValueDictionary)
 
 class KeyedRef(ref):
     """Specialized reference that includes a key corresponding to the value.
@@ -350,5 +349,3 @@ def update(self, dict=None, **kwargs):
                 d[ref(key, self._remove)] = value
         if len(kwargs):
             self.update(kwargs)
-
-collections.MutableMapping.register(WeakKeyDictionary)