diff --git a/data/conf/nginx/includes/site-defaults.conf b/data/conf/nginx/includes/site-defaults.conf
index 77e714d6..b38f4b2d 100644
--- a/data/conf/nginx/includes/site-defaults.conf
+++ b/data/conf/nginx/includes/site-defaults.conf
@@ -88,6 +88,11 @@
     return 301 /SOGo/dav;
   }
 
+  location ^~ /inc/lib/ {
+    deny all;
+    return 403;
+  }
+
   location ~ \.php$ {
     try_files $uri =404;
     fastcgi_split_path_info ^(.+\.php)(/.+)$;