diff --git a/reproserver/web/views.py b/reproserver/web/views.py
index f8498fa..e01c7d4 100644
--- a/reproserver/web/views.py
+++ b/reproserver/web/views.py
@@ -248,7 +248,8 @@ def reproduce(self, upload, repo_name=None, repo_url=None):
                 hosts = web1['config']['hosts']
             except KeyError:
                 pass
-            ports.update(host['port'] for host in hosts.values())
+            else:
+                ports.update(host['port'] for host in hosts.values())
 
         return self.render(
             'setup.html',