diff --git a/backend/route.py b/backend/route.py
index e691d1b04..48e8d44dc 100644
--- a/backend/route.py
+++ b/backend/route.py
@@ -45,7 +45,7 @@ def __init__(self, settings):
                                                                                          {"path": "static/img/"}),
             (r"/release/(?P<dataset>[^\/]+)/(?P<hash_value>[^\/]+)/(?P<file>[^\/]+)",handlers.TemporaryStaticNginxFileHandler,
                                                                                          {"path": "/release-files/"}),
-            (r"/release/(?P<dataset>[^\/]+)/(?:versions/(?P<ds_version>[^/]+)/)?(?P<file>[^\/]+)", handlers.AuthorizedStaticNginxFileHandler,
+            (r"/release/(?P<dataset>[^\/]+)/versions/(?P<ds_version>[^/]+)/(?P<file>[^\/]+)", handlers.AuthorizedStaticNginxFileHandler,
                                                                                          {"path": "/release-files/"}),
             ## Authentication
             (r"/logout",                                                              auth.ElixirLogoutHandler),