diff --git a/wx/lib/agw/persist/persistencemanager.py b/wx/lib/agw/persist/persistencemanager.py
index 51141f12..157f19a5 100644
--- a/wx/lib/agw/persist/persistencemanager.py
+++ b/wx/lib/agw/persist/persistencemanager.py
@@ -28,6 +28,7 @@
 This module contains the definitions of `PersistentObject` and `PersistenceManager` objects.
 """
 
+import six
 import wx
 import os
 import warnings
@@ -783,10 +784,10 @@ class PersistenceManager(object):
         kind = repr(value.__class__).split("'")[1]
 
         if self._customConfigHandler is not None:
-            result = self._customConfigHandler.SaveValue(self.GetKey(obj, keyName), repr((kind, unicode(value))))
+            result = self._customConfigHandler.SaveValue(self.GetKey(obj, keyName), repr((kind, six.text_type(value))))
         else:
             config = self.GetPersistenceFile()
-            result = config.Write(self.GetKey(obj, keyName), repr((kind, unicode(value))))
+            result = config.Write(self.GetKey(obj, keyName), repr((kind, six.text_type(value))))
             config.Flush()
 
         return result