diff --git a/src/pretix/base/exporter.py b/src/pretix/base/exporter.py
index 3d26ae2228..2eb07f5332 100644
--- a/src/pretix/base/exporter.py
+++ b/src/pretix/base/exporter.py
@@ -123,6 +123,7 @@ class JSONExporter(BaseExporter):
                         'total': o.total,
                         'positions': [
                             {
+                                'id': p.identity,
                                 'item': p.item_id,
                                 'variation': p.variation_id,
                                 'price': p.price,