diff --git a/Lib/bsddb/dbshelve.py b/Lib/bsddb/dbshelve.py
index a2d7bb7..8264f2d 100644
--- a/Lib/bsddb/dbshelve.py
+++ b/Lib/bsddb/dbshelve.py
@@ -38,12 +38,12 @@
     HIGHEST_PROTOCOL = pickle.HIGHEST_PROTOCOL
     def _dumps(object, protocol):
         return pickle.dumps(object, protocol=protocol)
-    from collections import MutableMapping
+    from UserDict import DictMixin
 else:
     HIGHEST_PROTOCOL = None
     def _dumps(object, protocol):
         return pickle.dumps(object, bin=protocol)
-    class MutableMapping: pass
+    class DictMixin: pass
 
 from . import db