diff --git a/docs/deploy.md b/docs/deploy.md
index f5f056c..e8f1f69 100644
--- a/docs/deploy.md
+++ b/docs/deploy.md
@@ -42,7 +42,7 @@ location = /_auth_proxy {
     internal;
 
     proxy_pass_request_body on;
-    proxy_set_header Content-Length $content_length;
+    proxy_set_header Content-Length "";
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Original-Host $host;
     proxy_set_header X-Original-URI $request_uri;