diff --git a/addons/account/account_invoice.py b/addons/account/account_invoice.py
index f0d2f2d8360..44531a1a266 100644
--- a/addons/account/account_invoice.py
+++ b/addons/account/account_invoice.py
@@ -1362,7 +1362,7 @@ class account_invoice_line(osv.osv):
         'partner_id': fields.related('invoice_id','partner_id',type='many2one',relation='res.partner',string='Partner',store=True)
     }
 
-    def default_account_id(self, cr, uid, ids, context=None):
+    def _default_account_id(self, cr, uid, ids, context=None):
         prop = self.pool.get('ir.property').get(cr, uid, 'property_account_income_categ', 'product.category', context=context)
         return prop and prop.id or False
 
@@ -1370,7 +1370,7 @@ class account_invoice_line(osv.osv):
         'quantity': 1,
         'discount': 0.0,
         'price_unit': _price_unit_default,
-        'account_id': default_account_id,
+        'account_id': _default_account_id,
     }
 
     def fields_view_get(self, cr, uid, view_id=None, view_type='form', context=None, toolbar=False, submenu=False):