diff --git a/bin/addons/base/ir/__init__.py b/bin/addons/base/ir/__init__.py
index 343b50a6998..145a167fdc2 100644
--- a/bin/addons/base/ir/__init__.py
+++ b/bin/addons/base/ir/__init__.py
@@ -34,6 +34,7 @@ import ir_exports
 import workflow
 import ir_rule
 import wizard
+import osv_memory_autovacuum
 
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
 
diff --git a/bin/addons/base/ir/ir.xml b/bin/addons/base/ir/ir.xml
index cb9b7a6d5bf..e3475faf721 100644
--- a/bin/addons/base/ir/ir.xml
+++ b/bin/addons/base/ir/ir.xml
@@ -1868,5 +1868,20 @@
 
         <menuitem action="act_ir_actions_todo_form" id="menu_ir_actions_todo_form"
                 parent="next_id_11" groups="base.group_extended" sequence="20"/>
+
+
+
+        <record model="ir.cron" id="cronjob_osv_memory_autovacuum">
+            <field name='name'>AutoVacuum osv_memory objects</field>
+            <field name='interval_number'>30</field>
+            <field name='interval_type'>minutes</field>
+            <field name="numbercall">-1</field>
+            <field name="active">True</field>
+            <field name="doall" eval="False" />
+            <field name="model">osv_memory.autovacuum</field>
+            <field name="function">power_on</field>
+            <field name="args">()</field>
+        </record>
+
     </data>
 </openerp>
diff --git a/bin/addons/base/ir/osv_memory_autovacuum.py b/bin/addons/base/ir/osv_memory_autovacuum.py
new file mode 100644
index 00000000000..b2ab938d740
--- /dev/null
+++ b/bin/addons/base/ir/osv_memory_autovacuum.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    OpenERP, Open Source Management Solution
+#    Copyright (C) 2010 OpenERP s.a. (<http://openerp.com>).
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from osv import osv
+from osv.orm import orm_memory
+
+class osv_memory_autovacuum(osv.osv_memory):
+    _name = 'osv_memory.autovacuum'
+
+    def power_on(self, cr, uid, context=None):
+        for model in self.pool.obj_list():
+            obj = self.pool.get(model)
+            if isinstance(obj, orm_memory):
+                obj.vaccum(cr, uid)
+        return True
+
+osv_memory_autovacuum()
+