diff --git a/package.json b/package.json
index d82e5d2330..ea2b0f2514 100644
--- a/package.json
+++ b/package.json
@@ -137,6 +137,7 @@
 		"js-yaml": "3.11.0",
 		"jsdom": "11.7.0",
 		"koa": "2.5.0",
+		"koa-body": "^2.5.0",
 		"koa-bodyparser": "4.2.0",
 		"koa-compress": "^2.0.0",
 		"koa-favicon": "2.0.1",
diff --git a/src/server/activitypub.ts b/src/server/activitypub.ts
index 804f0f870d..954cc7480e 100644
--- a/src/server/activitypub.ts
+++ b/src/server/activitypub.ts
@@ -1,4 +1,5 @@
 import * as Router from 'koa-router';
+const koaBody = require('koa-body');
 const parseRequest = require('http-signature');
 
 import { createHttp } from '../queue';
@@ -18,7 +19,7 @@ const router = new Router();
 //#region Routing
 
 // inbox
-router.post('/users/:user/inbox', ctx => {
+router.post('/users/:user/inbox', koaBody(), ctx => {
 	let signature;
 
 	ctx.req.headers.authorization = 'Signature ' + ctx.req.headers.signature;