diff --git a/src/models/poll-vote.ts b/src/models/poll-vote.ts
index 4d33b100e..4390e000c 100644
--- a/src/models/poll-vote.ts
+++ b/src/models/poll-vote.ts
@@ -2,6 +2,8 @@ import * as mongo from 'mongodb';
 import db from '../db/mongodb';
 
 const PollVote = db.get<IPollVote>('pollVotes');
+PollVote.createIndex('userId');
+PollVote.createIndex('noteId');
 export default PollVote;
 
 export interface IPollVote {