diff --git a/nginx.conf b/nginx.conf
index 56db890..cbb4a3e 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -105,7 +105,7 @@ http {
   # Add Content-Security-Policy for HTML documents.
   # h5bp/security/content-security-policy.conf
   map $sent_http_content_type $content_security_policy {
-    ~*text/(html|javascript)|application/pdf|xml "default-src 'self'; base-uri 'none'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests";
+    ~*text/(html|javascript)|application/pdf|xml "default-src 'self'; base-uri 'none'; form-action 'self'; frame-ancestors 'none'; object-src 'none'; upgrade-insecure-requests";
   }
 
   # Add Referrer-Policy for HTML documents.