diff --git a/eopayment/sips2.py b/eopayment/sips2.py
index 6675781..584ec56 100644
--- a/eopayment/sips2.py
+++ b/eopayment/sips2.py
@@ -171,7 +171,7 @@ class Payment(PaymentCommon):
                 address=None, email=None, phone=None, orderid=None,
                 info1=None, info2=None, info3=None, next_url=None, **kwargs):
         data = self.get_data()
-        transaction_id = self.transaction_id(6, string.digits, 'sips2', data['merchantId'])
+        transaction_id = self.transaction_id(10, string.digits, 'sips2', data['merchantId'])
         data['transactionReference'] = unicode(transaction_id)
         data['orderId'] = orderid or unicode(uuid.uuid4()).replace('-', '')
         if info1: