diff --git a/host-pottwal.yml b/host-pottwal.yml
index ae833e0..f433410 100644
--- a/host-pottwal.yml
+++ b/host-pottwal.yml
@@ -414,5 +414,6 @@
       vars:
         site_name: "{{ grafana_domain_name }}"
         proxy_port: "{{ grafana_host_port }}"
+        proxy_preserve_host: "On"
 
   handlers: