diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index faf6b1cd897..880d92fe8b3 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -1087,12 +1087,15 @@ class account_move_line(osv.osv):
         move_obj = self.pool.get('account.move')
         self._update_check(cr, uid, ids, context)
         result = False
+        move_ids = []
         for line in self.browse(cr, uid, ids, context=context):
+            if line.move_id not in move_ids:
+                move_ids.append(line.move_id.id)
             context['journal_id'] = line.journal_id.id
             context['period_id'] = line.period_id.id
             result = super(account_move_line, self).unlink(cr, uid, [line.id], context=context)
-            if check:
-                move_obj.validate(cr, uid, [line.move_id.id], context=context)
+        if check:
+            move_obj.validate(cr, uid, move_ids, context=context)
         return result
 
     def _check_date(self, cr, uid, vals, context=None, check=True):