diff --git a/lib/shared/messages/reaction-message-spec.js b/lib/shared/messages/reaction-message-spec.js
--- a/lib/shared/messages/reaction-message-spec.js
+++ b/lib/shared/messages/reaction-message-spec.js
@@ -18,13 +18,19 @@
   RawReactionMessageInfo,
   ReactionMessageInfo,
 > = Object.freeze({
-  messageContentForClientDB(data: RawReactionMessageInfo): string {
+  messageContentForServerDB(
+    data: ReactionMessageData | RawReactionMessageInfo,
+  ): string {
     return JSON.stringify({
       targetMessageID: data.targetMessageID,
       reaction: data.reaction,
     });
   },
 
+  messageContentForClientDB(data: RawReactionMessageInfo): string {
+    return this.messageContentForServerDB(data);
+  },
+
   messageTitle({
     messageInfo,
     threadInfo,