diff --git a/templates/web.template.yml b/templates/web.template.yml
index d5dd09526..5a7c18790 100644
--- a/templates/web.template.yml
+++ b/templates/web.template.yml
@@ -146,6 +146,7 @@ run:
       filename: "/etc/nginx/conf.d/discourse.conf"
       from: /upstream[^\}]+\}/m
       to: "upstream discourse {
+        set_header Host $http_host;
         server 127.0.0.1:3000;
       }"