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
@@ -239,4 +239,21 @@
     }
     return originalMessage.creatorID === params.viewerID;
   },
+
+  getLastUpdatedTime:
+    (
+      messageInfo: ReactionMessageInfo | RawReactionMessageInfo,
+      params: ShowInMessagePreviewParams,
+    ) =>
+    async () => {
+      const originalMessage = await params.fetchMessage(
+        messageInfo.targetMessageID,
+      );
+      if (!originalMessage) {
+        return null;
+      }
+      return originalMessage.creatorID === params.viewerID
+        ? messageInfo.time
+        : null;
+    },
 });