diff --git a/buildbot/master.cfg b/buildbot/master.cfg
index bcca5e4..824062f 100644
--- a/buildbot/master.cfg
+++ b/buildbot/master.cfg
@@ -473,7 +473,10 @@ if 'ulpath' in config:
     ulpath = config['ulpath']
 else:
     ulpath = 'archive_staging'
-ulpath_unique = ulpath+'-%(buildername)s'
+if 'ulpath_unique' in config:
+    ulpath_unique = config['ulpath_unique']
+else:
+    ulpath_unique = ulpath+'-%(buildername)s'
 
 @util.renderer
 def make_build_url(props):