diff --git a/backend/src/entities/content/attachment.entity.ts b/backend/src/entities/content/attachment.entity.ts
index 7a9dd946..8225ebf2 100644
--- a/backend/src/entities/content/attachment.entity.ts
+++ b/backend/src/entities/content/attachment.entity.ts
@@ -1,7 +1,12 @@
 import { Entity, ManyToOne, PrimaryKey, Property } from '@mikro-orm/core';
 import { LearningObject } from './learning-object.entity.js';
+import { AttachmentRepository } from '../../data/content/attachment-repository.js';
 
-@Entity()
+@Entity({
+    repository: () => {
+        return AttachmentRepository;
+    },
+})
 export class Attachment {
     @ManyToOne({
         entity: () => {