diff --git a/apps/server/src/models/history.model.ts b/apps/server/src/models/history.model.ts
index 857a0b6..015df87 100644
--- a/apps/server/src/models/history.model.ts
+++ b/apps/server/src/models/history.model.ts
@@ -67,7 +67,7 @@ export class GameHistoryRepository {
         if (k !== `game::${game_id}::${key}`) {
           const kTotal = parseInt((await this.redis.get(k)) || '0')
           if (kTotal < total - vote) {
-            this.redis.incrBy(k, Math.round(0.5 - (kTotal / (total + kTotal)) * vote))
+            this.redis.incrBy(k, Math.round((0.5 - (kTotal / (total + kTotal))) * vote))
           }
         }
       })