diff --git a/packages/tests/src/api/server/config.ts b/packages/tests/src/api/server/config.ts
index 71694b396..baa9b0574 100644
--- a/packages/tests/src/api/server/config.ts
+++ b/packages/tests/src/api/server/config.ts
@@ -631,6 +631,10 @@ describe('Test config', function () {
     await testFileExistsOrNot(server, 'avatars', basename(bannerPath), true)
   })
 
+  it('Should re-update an existing instance banner', async function () {
+    await server.config.updateInstanceBanner({ fixture: 'banner.jpg' })
+  })
+
   it('Should remove instance banner', async function () {
     await server.config.deleteInstanceBanner()
 
diff --git a/server/core/controllers/api/config.ts b/server/core/controllers/api/config.ts
index 86cd8d35e..6630cb40b 100644
--- a/server/core/controllers/api/config.ts
+++ b/server/core/controllers/api/config.ts
@@ -158,16 +158,19 @@ async function updateCustomConfig (req: express.Request, res: express.Response)
 async function updateInstanceBanner (req: express.Request, res: express.Response) {
   const bannerPhysicalFile = req.files['bannerfile'][0]
 
-  const accountServer = (await getServerActor()).Account
-  await updateLocalActorImageFiles(accountServer, bannerPhysicalFile, ActorImageType.BANNER)
+  const serverActor = await getServerActor()
+  serverActor.Banners = await ActorImageModel.listByActor(serverActor, ActorImageType.BANNER) // Reload banners from DB
+
+  await updateLocalActorImageFiles(serverActor.Account, bannerPhysicalFile, ActorImageType.BANNER)
 
   return res.sendStatus(HttpStatusCode.NO_CONTENT_204)
 }
 
 async function deleteInstanceBanner (req: express.Request, res: express.Response) {
-  const accountServer = (await getServerActor()).Account
+  const serverActor = await getServerActor()
+  serverActor.Banners = await ActorImageModel.listByActor(serverActor, ActorImageType.BANNER) // Reload banners from DB
 
-  await deleteLocalActorImageFile(accountServer, ActorImageType.BANNER)
+  await deleteLocalActorImageFile(serverActor.Account, ActorImageType.BANNER)
 
   return res.sendStatus(HttpStatusCode.NO_CONTENT_204)
 }