1 files changed, 3 insertions, 2 deletions

diff --git a/server/lib/local-actor.ts b/server/lib/local-actor.ts
index 55e77dd04..2d2bd43a1 100644
--- a/server/lib/local-actor.ts
+++ b/server/lib/local-actor.ts
@@ -1,8 +1,9 @@
 import 'multer'
 import { queue } from 'async'
 import * as LRUCache from 'lru-cache'
-import { extname, join } from 'path'
+import { join } from 'path'
 import { v4 as uuidv4 } from 'uuid'
+import { getLowercaseExtension } from '@server/helpers/core-utils'
 import { ActorModel } from '@server/models/actor/actor'
 import { ActivityPubActorType, ActorImageType } from '@shared/models'
 import { retryTransactionWrapper } from '../helpers/database-utils'
@@ -41,7 +42,7 @@ async function updateLocalActorImageFile (
     ? ACTOR_IMAGES_SIZE.AVATARS
     : ACTOR_IMAGES_SIZE.BANNERS
 
-  const extension = extname(imagePhysicalFile.filename)
+  const extension = getLowercaseExtension(imagePhysicalFile.filename)
 
   const imageName = uuidv4() + extension
   const destination = join(CONFIG.STORAGE.ACTOR_IMAGES, imageName)