diff --git a/src/achievement/achievement.entity.ts b/src/achievement/achievement.entity.ts
index da9fac0..06ca6b7 100644
--- a/src/achievement/achievement.entity.ts
+++ b/src/achievement/achievement.entity.ts
@@ -33,6 +33,6 @@ export class Achievement {
   @Column({ name: 'reward_gold', default: 0 })
   rewardGold: number;
 
-  @Column({ name: 'reward_title', length: 100, nullable: true })
+  @Column({ type: 'varchar', name: 'reward_title', length: 100, nullable: true })
   rewardTitle: string | null;
 }