diff --git a/app/services/emoji_react_service.rb b/app/services/emoji_react_service.rb
index 9a166a3413..fa7f8d0f68 100644
--- a/app/services/emoji_react_service.rb
+++ b/app/services/emoji_react_service.rb
@@ -79,7 +79,7 @@ class EmojiReactService < BaseService
   end
 
   def build_json(emoji_reaction)
-    Oj.dump(serialize_payload(emoji_reaction, ActivityPub::EmojiReactionSerializer))
+    Oj.dump(serialize_payload(emoji_reaction, ActivityPub::EmojiReactionSerializer, signer: emoji_reaction.account))
   end
 
   def render_emoji_reaction(emoji_group)