diff --git a/aleksis/apps/tezor/migrations/0001_initial.py b/aleksis/apps/tezor/migrations/0001_initial.py
index 16716174e4829ed019de800d4d83e803f95bee6d..98802cabe1a043e935049e80df04c07b1ce497e7 100644
--- a/aleksis/apps/tezor/migrations/0001_initial.py
+++ b/aleksis/apps/tezor/migrations/0001_initial.py
@@ -85,7 +85,7 @@ class Migration(migrations.Migration):
         ),
         migrations.AddConstraint(
             model_name='invoice',
-            constraint=models.UniqueConstraint(fields=('transaction_id', 'group'), name='number_uniq_per_group'),
+            constraint=models.UniqueConstraint(fields=('number', 'group'), name='number_uniq_per_group'),
         ),
         migrations.AddConstraint(
             model_name='client',