diff --git a/web/generic_signature_storage.js b/web/generic_signature_storage.js
index 7f5f6bcf9..4e25fafbd 100644
--- a/web/generic_signature_storage.js
+++ b/web/generic_signature_storage.js
@@ -36,7 +36,7 @@ class SignatureStorage {
   #save() {
     localStorage.setItem(
       KEY_STORAGE,
-      JSON.stringify(Object.fromEntries(this.#signatures.entries()))
+      JSON.stringify(Object.fromEntries(this.#signatures))
     );
   }