diff --git a/alkatorapi/views.py b/alkatorapi/views.py
index e1765ec..5f88879 100644
--- a/alkatorapi/views.py
+++ b/alkatorapi/views.py
@@ -183,7 +183,7 @@ def login_status(request):
 @csrf_exempt
 def change_racer(request):
     try:
-        racer = Racer.objects.get(request.POST['invoice_id'])
+        racer = Racer.objects.get(invoice_id=request.POST['invoice_id']).pre
         if request.user != racer.profile.user:
             return HttpResponse('{"reason":"Nedostatečná práva!"}', status=400, content_type='application/json')
         if date.today() >= DEADLINE: