diff --git a/asyncio_mongo/database.py b/asyncio_mongo/database.py
index 653c43e..c934528 100644
--- a/asyncio_mongo/database.py
+++ b/asyncio_mongo/database.py
@@ -18,6 +18,7 @@ from asyncio_mongo._pymongo import helpers
 from asyncio_mongo.collection import Collection
 from asyncio import coroutine
 from asyncio_mongo.exceptions import ErrorReply
+from pymongo import auth
 
 
 class Database(object):
@@ -100,7 +101,7 @@ class Database(object):
     @coroutine
     def authenticate_with_nonce(self, result, name, password):
         nonce = result['nonce']
-        key = helpers._auth_key(nonce, name, password)
+        key = auth._auth_key(nonce, name, password)
 
         # hacky because order matters
         auth_command = SON(authenticate=1)
diff --git a/setup.py b/setup.py
index ebe647a..168675c 100755
--- a/setup.py
+++ b/setup.py
@@ -93,7 +93,7 @@ else:
 
 setup(
     name="asyncio_mongo",
-    version="0.2.1",
+    version="0.2.2",
     description="Asynchronous Python 3.3+ driver for MongoDB <http://www.mongodb.org>",
     author="Alexandre Fiori, Don Brown",
     author_email="mrdon@twdata.org",