diff --git a/docs/deployment/illustrations-static.nginx b/docs/deployment/illustrations-static.nginx
index add3da9a..8a75db38 100644
--- a/docs/deployment/illustrations-static.nginx
+++ b/docs/deployment/illustrations-static.nginx
@@ -4,7 +4,7 @@ location ^~ /images/illustrations/ {
     if ($uri !~ "^/images/illustrations/[a-f0-9]{64}\.(webp|png|jpg|gif)$") { return 404; }
     try_files $uri =404;
     etag on;
-    add_header Cache-Control "public, max-age=31536000, immutable" always;
+    add_header Cache-Control "public, max-age=31536000, immutable";
     add_header X-Content-Type-Options nosniff always;
     add_header X-Illustration-Delivery static always;
 }