diff --git a/packages/backend/src/server/ActivityPubServerService.ts b/packages/backend/src/server/ActivityPubServerService.ts
index 94a277f4a4..d1361ed5e9 100644
--- a/packages/backend/src/server/ActivityPubServerService.ts
+++ b/packages/backend/src/server/ActivityPubServerService.ts
@@ -433,6 +433,8 @@ export class ActivityPubServerService {
 		});
 
 		fastify.register(fastifyAccepts);
+		fastify.addContentTypeParser('application/activity+json', { parseAs: 'string' }, fastify.getDefaultJsonParser('ignore', 'ignore'));
+		fastify.addContentTypeParser('application/ld+json', { parseAs: 'string' }, fastify.getDefaultJsonParser('ignore', 'ignore'));
 
 		//#region Routing
 		// inbox