diff --git a/src/media/media.service.ts b/src/media/media.service.ts
index 259c94829..5debe2d59 100644
--- a/src/media/media.service.ts
+++ b/src/media/media.service.ts
@@ -202,6 +202,10 @@ export class MediaService {
         return BackendType.S3;
       case 'webdav':
         return BackendType.WEBDAV;
+      default:
+        throw new Error(
+          `Unexpected media backend ${this.mediaConfig.backend.use}`,
+        );
     }
   }