diff --git a/addons/product/product.py b/addons/product/product.py
index 90348783a0c..8378e682dae 100644
--- a/addons/product/product.py
+++ b/addons/product/product.py
@@ -174,7 +174,7 @@ product_ul()
 #----------------------------------------------------------
 class product_category(osv.osv):
 
-    def name_get(self, cr, uid, ids, context={}):
+    def name_get(self, cr, uid, ids, context=None):
         if not len(ids):
             return []
         reads = self.read(cr, uid, ids, ['name','parent_id'], context)
@@ -187,7 +187,7 @@ class product_category(osv.osv):
         return res
 
     def _name_get_fnc(self, cr, uid, ids, prop, unknow_none, context):
-        res = self.name_get(cr, uid, ids)
+        res = self.name_get(cr, uid, ids, context)
         return dict(res)
 
     _name = "product.category"