diff --git a/kfet/views.py b/kfet/views.py
index e59720c0..c50fb33e 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -1476,7 +1476,7 @@ def history_json(request):
         opegroups = opegroups.filter(at__lt=end)
         transfergroups = transfergroups.filter(at__lt=end)
     if checkout:
-        opegroups = opegroups.filter(checkout__in=checkout)
+        opegroups = opegroups.filter(checkout=checkout)
         transfergroups = TransferGroup.objects.none()
     if transfers_only:
         opegroups = OperationGroup.objects.none()