diff --git a/gracedb/events/views.py b/gracedb/events/views.py
index 693056599f61643cc3572377b0cf3fbbb03a2666..dc1f0d2f9ab727346c1cf07591b6016c80b870c5 100644
--- a/gracedb/events/views.py
+++ b/gracedb/events/views.py
@@ -878,7 +878,7 @@ def file_download(request, event, filename):
             msg = "You do not have permission to view this file."
             return HttpResponseForbidden(msg)
 
-    file_path = os.path.join(event.datadir, filename)
+    file_path = os.path.join(event.datadir(), filename)
     return check_and_serve_file(request, file_path,
         ResponseClass=HttpResponse)