diff --git a/packages/database/src/queries/messages/helpers/merge-entries.ts b/packages/database/src/queries/messages/helpers/merge-entries.ts
index 4a001c2f5..014f16e5b 100644
--- a/packages/database/src/queries/messages/helpers/merge-entries.ts
+++ b/packages/database/src/queries/messages/helpers/merge-entries.ts
@@ -67,7 +67,7 @@ export function mergeReasoningMessages(
 
   // Create a map of new messages by ID
   const updateMap = new Map<string, ChatMessageReasoningMessage>();
-  const updateIds = new Set<string>();
+  const updateMap = new Map<string, ChatMessageReasoningMessage>();
 
   for (const msg of updates) {
     updateMap.set(msg.id, msg);