diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/notification/ExposedNotificationRepository.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/notification/ExposedNotificationRepository.kt
index ab3c23b6..9c82f69e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/notification/ExposedNotificationRepository.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/notification/ExposedNotificationRepository.kt
@@ -82,4 +82,6 @@ object Notifications : Table("notifications") {
     val text = varchar("text", 3000).nullable()
     val reactionId = long("reaction_id").references(Reactions.id).nullable()
     val createdAt = timestamp("created_at")
+
+    override val primaryKey: PrimaryKey = PrimaryKey(id)
 }