diff --git a/addons/anonymization/anonymization.py b/addons/anonymization/anonymization.py
index c4ef22f8a80..e38a2c4f8c4 100644
--- a/addons/anonymization/anonymization.py
+++ b/addons/anonymization/anonymization.py
@@ -4,14 +4,11 @@
 from lxml import etree
 import os
 import base64
-try:
-    import cPickle as pickle
-except ImportError:
-    import pickle
 import random
 import datetime
 from openerp.release import version_info
 from openerp.osv import fields, osv
+from openerp.tools import pickle
 from openerp.tools.translate import _
 from openerp.tools.safe_eval import safe_eval as eval
 
@@ -447,7 +444,7 @@ class ir_model_fields_anonymize_wizard(osv.osv_memory):
 
         # save pickle:
         fn = open(abs_filepath, 'w')
-        pickle.dump(data, fn, pickle.HIGHEST_PROTOCOL)
+        pickle.dump(data, fn, -1)
 
         # update the anonymization fields:
         values = {