diff --git a/addons/account/account_bank_statement.py b/addons/account/account_bank_statement.py
index a4431518a08..d1cf95604bf 100644
--- a/addons/account/account_bank_statement.py
+++ b/addons/account/account_bank_statement.py
@@ -574,7 +574,7 @@ class account_bank_statement_line(osv.osv):
         'account_id': fields.many2one('account.account','Account',
             required=True),
         'statement_id': fields.many2one('account.bank.statement', 'Statement',
-            select=True, required=True),
+            select=True, required=True, ondelete='cascade'),
         'reconcile_id': fields.many2one('account.bank.statement.reconcile',
             'Reconcile', states={'confirm':[('readonly',True)]}),
         'move_ids': fields.many2many('account.move',