diff --git a/oauth2client/contrib/_appengine_ndb.py b/oauth2client/contrib/_appengine_ndb.py
index 24f5eec08..44c0daca8 100644
--- a/oauth2client/contrib/_appengine_ndb.py
+++ b/oauth2client/contrib/_appengine_ndb.py
@@ -23,7 +23,7 @@
 
 from google.appengine.ext import ndb
 
-from oauth2client import client as client_mod
+from oauth2client import client
 
 
 NDB_KEY = ndb.Key
@@ -75,7 +75,7 @@ def _validate(self, value):
             TypeError if the value is not an instance of Flow.
         """
         _LOGGER.info('validate: Got type %s', type(value))
-        if value is not None and not isinstance(value, client_mod.Flow):
+        if value is not None and not isinstance(value, client.Flow):
             raise TypeError('Property %s must be convertible to a flow '
                             'instance; received: %s.' % (self._name,
                                                          value))
@@ -103,7 +103,7 @@ def _validate(self, value):
             TypeError if the value is not an instance of Credentials.
         """
         _LOGGER.info('validate: Got type %s', type(value))
-        if value is not None and not isinstance(value, client_mod.Credentials):
+        if value is not None and not isinstance(value, client.Credentials):
             raise TypeError('Property %s must be convertible to a '
                             'credentials instance; received: %s.' %
                             (self._name, value))
@@ -138,7 +138,7 @@ def _from_base_type(self, value):
             return None
         try:
             # Uses the from_json method of the implied class of value
-            credentials = client_mod.Credentials.new_from_json(value)
+            credentials = client.Credentials.new_from_json(value)
         except ValueError:
             credentials = None
         return credentials