diff --git a/lib/web/fetch/formdata.js b/lib/web/fetch/formdata.js
index 9249ccc87f2..c5ae0834bf0 100644
--- a/lib/web/fetch/formdata.js
+++ b/lib/web/fetch/formdata.js
@@ -169,7 +169,7 @@ class FormData {
       }
 
       return a
-    }, {})
+    }, { __proto__: null })
 
     options.depth ??= depth
     options.colors ??= true