diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index 1cb4c17f33a..32e8f79777f 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -415,7 +415,6 @@ class account_voucher(osv.osv):
         line_ids = resolve_o2m_operations(cr, uid, line_pool, line_ids, ["amount"], context)
 
         total_tax = 0.0
-        net_tax = 0.0
         for line in line_ids:
             line_amount = 0.0
             line_amount = line.get('amount',0.0)