diff --git a/smash/web/forms/voucher_forms.py b/smash/web/forms/voucher_forms.py
index 67dabe3c04ee6675ed6a721c71d9e1002d02798b..12aaa87601afa721a9c9c84d7e7cd20f283d4a0a 100644
--- a/smash/web/forms/voucher_forms.py
+++ b/smash/web/forms/voucher_forms.py
@@ -70,7 +70,7 @@ class VoucherForm(ModelForm):
             instance.expiry_date = instance.issue_date + datetime.timedelta(days=90)
             max_id = str(1).zfill(5)
             if Voucher.objects.all().count() > 0:
-                max_id = str(Voucher.objects.latest('id').id + 1).zfill(5)
+                max_id = str(Voucher.objects.latest('id').id + 1).zfill(4)
             # number in format  {ND_NUMBER}-{DATE}-{VOUCHER_TYPE_CODE}-{VOUCHER_TYPE}-{SEQ_NUMBER}{CHECKSUM}
             instance.number = instance.study_subject.nd_number + "-" + \
                               datetime.datetime.now().strftime("%Y%m%d") + "-" + \