diff --git a/extensions/browser/computed_hashes.cc b/extensions/browser/computed_hashes.cc
index 263eaa6..1533306b 100644
--- a/extensions/browser/computed_hashes.cc
+++ b/extensions/browser/computed_hashes.cc
@@ -159,7 +159,7 @@
   for (const auto& hash : hashes) {
     std::string encoded;
     base::Base64Encode(hash, &encoded);
-    block_hashes->GetList().emplace_back(std::move(encoded));
+    block_hashes->Append(std::move(encoded));
   }
 
   auto dict = std::make_unique<base::DictionaryValue>();