diff --git a/backend/src/controllers/learning-objects.ts b/backend/src/controllers/learning-objects.ts
index 8f5b18b9..eb5c587a 100644
--- a/backend/src/controllers/learning-objects.ts
+++ b/backend/src/controllers/learning-objects.ts
@@ -6,7 +6,7 @@ import { EnvVars, getEnvVar } from '../util/envvars.js';
 import { Language } from '../entities/content/language.js';
 import attachmentService from '../services/learning-objects/attachment-service.js';
 import { NotFoundError } from '@mikro-orm/core';
-import {BadRequestException} from "../exceptions/badRequestException";
+import {BadRequestException} from "../exceptions/bad-request-exception.js";
 
 function getLearningObjectIdentifierFromRequest(req: Request): LearningObjectIdentifier {
     if (!req.params.hruid) {
diff --git a/backend/src/controllers/learning-paths.ts b/backend/src/controllers/learning-paths.ts
index bf6f94d7..67b11d13 100644
--- a/backend/src/controllers/learning-paths.ts
+++ b/backend/src/controllers/learning-paths.ts
@@ -8,8 +8,8 @@ import {
     personalizedForGroup,
     personalizedForStudent,
 } from '../services/learning-paths/learning-path-personalization-util.js';
-import {BadRequestException} from "../exceptions/badRequestException";
-import {NotFoundException} from "../exceptions/not-found-exception";
+import {BadRequestException} from "../exceptions/bad-request-exception.js";
+import {NotFoundException} from "../exceptions/not-found-exception.js";
 
 /**
  * Fetch learning paths based on query parameters.
diff --git a/backend/src/exceptions/bad-request-exception.ts b/backend/src/exceptions/bad-request-exception.ts
index eb5d4db0..fa2ae17a 100644
--- a/backend/src/exceptions/bad-request-exception.ts
+++ b/backend/src/exceptions/bad-request-exception.ts
@@ -3,7 +3,7 @@ import {ExceptionWithHttpState} from "./exception-with-http-state.js";
 /**
  * Exception for HTTP 400 Bad Request
  */
-export abstract class BadRequestException extends ExceptionWithHttpState {
+export class BadRequestException extends ExceptionWithHttpState {
     constructor(error: string) {
         super(400, error);
     }