diff --git a/src/pretix/control/views/orders.py b/src/pretix/control/views/orders.py
index fe6ad2aff..d01109b59 100644
--- a/src/pretix/control/views/orders.py
+++ b/src/pretix/control/views/orders.py
@@ -2276,7 +2276,7 @@ class ExportMixin:
                 continue
 
             if self.scheduled:
-                initial = self.scheduled.export_form_data
+                initial = dict(self.scheduled.export_form_data)
 
                 test_form = ExporterForm(data=self.request.GET, prefix=ex.identifier)
                 test_form.fields = ex.export_form_fields
diff --git a/src/pretix/control/views/organizer.py b/src/pretix/control/views/organizer.py
index ae531e358..20a6ffdb2 100644
--- a/src/pretix/control/views/organizer.py
+++ b/src/pretix/control/views/organizer.py
@@ -1550,7 +1550,7 @@ class ExportMixin:
             if id != ex.identifier:
                 continue
             if self.scheduled:
-                initial = self.scheduled.export_form_data
+                initial = dict(self.scheduled.export_form_data)
 
                 test_form = ExporterForm(data=self.request.GET, prefix=ex.identifier)
                 test_form.fields = ex.export_form_fields