diff --git a/confirmation/migrations/0015_alter_confirmation_object_id.py b/confirmation/migrations/0015_alter_confirmation_object_id.py
new file mode 100644
index 0000000000..fc34226ae8
--- /dev/null
+++ b/confirmation/migrations/0015_alter_confirmation_object_id.py
@@ -0,0 +1,15 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("confirmation", "0014_confirmation_confirmatio_content_80155a_idx"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="confirmation",
+            name="object_id",
+            field=models.PositiveBigIntegerField(db_index=True),
+        ),
+    ]
diff --git a/confirmation/models.py b/confirmation/models.py
index 90fac69d66..262d196fee 100644
--- a/confirmation/models.py
+++ b/confirmation/models.py
@@ -209,7 +209,7 @@ def confirmation_url(
 
 class Confirmation(models.Model):
     content_type = models.ForeignKey(ContentType, on_delete=CASCADE)
-    object_id = models.PositiveIntegerField(db_index=True)
+    object_id = models.PositiveBigIntegerField(db_index=True)
     content_object = GenericForeignKey("content_type", "object_id")
     date_sent = models.DateTimeField(db_index=True)
     confirmation_key = models.CharField(max_length=40, db_index=True)