diff --git a/openerp/addons/base/ir/ir_model.py b/openerp/addons/base/ir/ir_model.py
index 6da502f29b8..ad0912a59ee 100644
--- a/openerp/addons/base/ir/ir_model.py
+++ b/openerp/addons/base/ir/ir_model.py
@@ -162,7 +162,7 @@ class ir_model(osv.osv):
             pass
         x_custom_model._name = model
         x_custom_model._module = False
-        a = x_custom_model.createInstance(self.pool, '', cr)
+        a = x_custom_model.createInstance(self.pool, cr)
         if (not a._columns) or ('x_name' in a._columns.keys()):
             x_name = 'x_name'
         else: