diff --git a/Docker_Registry_Install_Guide.md b/Docker_Registry_Install_Guide.md
index f8e6e46..1022b19 100644
--- a/Docker_Registry_Install_Guide.md
+++ b/Docker_Registry_Install_Guide.md
@@ -254,7 +254,7 @@ http {
     location /v2/ {
       limit_req zone=reg_write burst=10;
       proxy_pass http://reg;
-      proxy_set_header Host $host;
+      proxy_set_header Host $host:$server_port;
       proxy_set_header X-Forwarded-Proto https;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       add_header Docker-Distribution-Api-Version "registry/2.0" always;