diff --git a/nginx.tmpl b/nginx.tmpl
index e79f790..c0c9ed0 100644
--- a/nginx.tmpl
+++ b/nginx.tmpl
@@ -55,6 +55,11 @@ map $http_x_forwarded_proto $proxy_x_forwarded_proto {
   ''      $scheme;
 }
 
+map $http_x_forwarded_host $proxy_x_forwarded_host {
+  default $http_x_forwarded_host;
+  ''      $http_host;
+}
+
 # If we receive X-Forwarded-Port, pass it through; otherwise, pass along the
 # server port the client connected to
 map $http_x_forwarded_port $proxy_x_forwarded_port {
@@ -111,6 +116,7 @@ proxy_set_header Upgrade $http_upgrade;
 proxy_set_header Connection $proxy_connection;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+proxy_set_header X-Forwarded-Host $proxy_x_forwarded_host;
 proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
 proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
 proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;