diff --git a/source/installation_and_configuration/authentication/sunstone_auth.rst b/source/installation_and_configuration/authentication/sunstone_auth.rst
index 6277fed442..6b8850c7fd 100644
--- a/source/installation_and_configuration/authentication/sunstone_auth.rst
+++ b/source/installation_and_configuration/authentication/sunstone_auth.rst
@@ -131,7 +131,7 @@ Nginx
     ssl_verify_client optional;  
     location / {
         ...
-        proxy_set_header X-Client-Dn $client_dn;
+        proxy_set_header X-Client-Dn $ssl_client_s_dn;
     }